My preferred worflow is to create a single sketch and share it between multiple features, rather than draw a lot of duplicate lines. This takes takes far too many clicks : click the little plus sign to unhide the sketch, right click the sketch, click "share," click the little minus sign to rehide the sketch (this step is theoretically skippable but doing so will make your model tree a mess), create the second feature, right click the now-visible shared sketch, click Visibility to make it invisible again. I feel like I spend half my day repeating those steps.
If you try to extrude/revolve/whatever without a shared (or new) sketch, you get a warning that "a 2d sketch is required to extrude/etc" with a prompt to create a sketch. I think that window should also have buttons to (2) "select a sketch to share" (this would temporarily "click" all those little plus signs and then once you make your selection "click" all the little minus signs) and, far more importantly, (1) "auto-share the most recently used sketch."
(A note about Visibility. Extruding/etc from a new sketch makes it unavailable for re-use [until you share it] and as such automatically turns its Visibility off. Extruding/etc from a shared sketch does not make it unavailable for re-use and as such does not turn its Visibility off. This makes sense, but as I already mentioned results in wasted mouse movement and clicks. Were the "auto-share" feature added, this could change: extruding/etc from a shared sketch could turn its Visibility off because re-using it again would be a simple matter of clicking the "auto-share the most recently used sketch" button again (though it this case the button's functionality would actually be "make most recently used sketch Visible"). )