AutoCAD LT
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Re: Opinions of Model Space vs. Paper Space.
Create your WYSIWYG views of paper in a Layout.
Change Scales and Views of a Modelspace drawing.
Put multiple areas of Modelspace in different Viewports at different scales in the same Paperspace layout.
Create the Layout once and then just right click the tab and print.
Why create a Window view of the Modelspace entities every time you want to plot something?
Why need a Title Block set to every page you wish to print? Maybe an XREF to do so? Or it is already there in Layout.
Fields and Viewports for common info. Use the Drawing Properties dialog to get this information into your drawing one time. Set it and Forget it to borrow a tag line.
BTW - Layers and Paperspace are two different animals. Layers for different entities and Paperspace to show those entities. Why create (copy) two, three, or four floor plans? Put all your information in one place in Modelspace and then turn off or on the layers you need in Paperspace. Have that Floor Plan, Electric Plan, Structural Plan, Braced Wall plan whatever done for you without Layer filters or hunting and picking what to turn on and off each time.
Same plan area, four scales, different Layers shown, priceless...
Re: Opinions of Model Space vs. Paper Space.
If you don't need to.....
- show different scales of your drawing on a single sheet
- show multiple views of your drawing with different layers on/off/frozen and/or different colors for layers on a single sheet.
- have different multiple titleblocks for different portions of your drawings (for example, the full sized sheet for the overall, plus smaller sheets for changes or addenda, and different titleblocks for presentations or contractor or state/local authority submittals etc.).
- change titleblocks because you never have to plot a site plan, then a closer building plan, then a closer detail plan because you never ever need to put or have all the information in a single DWG file.
... then you don't really have a use for paperspace.
Don't force your opinions or limitations on others, there is no right way or wrong way, both methods are there because we don't all work the same way. Just make sure FEAR OF THE UNKNOWN is the only reason you are not exploring the other option if you truly need it.
"... I've only ever done it this way since..." is the no reason to only do one thing one way anywhere or with anything too.
Happy cadding.
...takes me back to when I really was Modman. We only used modelspace in modulars, and thought paperspace was like a Turkish prison. But for different sheet sizes we had to change the plotting parameters. For arranging views of differing scales on one sheet, something had to be turned into a block (and updates meant redefining that block). To show two views of differing layer setups required 2 copies of the model.
Once I started playing around with how to show (and plot) the 3 standard Orthographic views plus one Isometric view of a model at the same time, I went through that same laborious learning process, including going back and forth through the Help files. But once I discovered what paperspace can do (plus the fact it's like having a best friend right next door), I jumped in with both feet! OP, imagine setting up one layout tab (paperspace) for the overall floor plan (using frozen layers), setting up the plot parameters on it, and then copying it (creating more tabs) for your RCP, Mechanical etc. MEP drawings often use the architectural as a grayed-out background. Since 2008 AutoCAD has allowed you to change colors and even linetypes on a per-layer, per-viewport basis, without adversely affecting the model's original colors/linetypes. You can even create objects, dimensions, text etc that is "annotative" -- that is, you create it once and then use it on the fly in differently scaled viewports, and it'll automatically adjust to the size you wish it to look in paperspace.
If you do start down this path, a couple of friendly tips -- set a viewport's scale and then lock it; know the difference between setting layer properties globally and setting them on a per-viewport basis; and if you get into annotative objects, learn about setting CANNOSCALE in modelspace (it'll save you tons of headaches figuring out how to get your linetype scales all correct everywhere). Welcome to The Dark side, and good luck! 
Paperspace tabs does not slow down AutoCAD, but lots of Xrefs can on low end hardware: that's the correct information. File size is irrelevant too. No need to find 'documentatiom', a quick field test proves it.
With the absence of a Sheet Set Manager in LT until LT2012, it may be their way of managing plot files without affecting whomeever is working in a DWG at the tile. Working with them to figure it out is the better approach. If they have LT2012, jump into SSM quickly, if not, have them get into PUBLISH and saved Sheets as a minimum for managing plots and output.
