SSM can be handy on any size project. The setup can be automated fairly easily and I have done so for my company. Sheet titles and numbers are automatically updated once typed into SSM, thanks to the way the blocks are set up. It can save time even on a 10 drawing set, but it also ensures quality and consistency if you happen to renumber sheets. I also use it to keep my employees to get in the habit of using it, period. Don't squable or think over "is this project too small or too big". It's easy to use, so just use it on all projects. It's also very convenient for opening and looking for drawings...eliminates all the guess work or having to go straight to the index. It's all right in front of you.
As for putting a ton of drawings in 1 file using layout times, in our firm, that has shown to be evil, evil, evil. Especially when you have imagery involved.