Hey wildmike, you're right, the simpler the better, unless it sacrifices some benefit, like sensitivity or speed, etc.
You're also right that it is difficult to remember some of these things without constant practice, but I would hope that the members here, with their focus being on wilderness skills and survival would practice regularly enough to be able to construct the traps, snares and everything else that's applicable. Not only being beneficial to remembering the set ups, it's a lot of fun and by doing it on a regular basis, new things are learned.
Having said that, I do think that memory aids are useful, such as the cheat sheet thread.
I don't think it's necessary to learn 30 or 40 trap set-ups any more than it is to learn 30 or 40 knots. Find one or 2 in each category (deadfall, drowning, lifting pole snare, etc.) that works
for you and practice these every once in awhile, so that if and when the time comes.................
Doc (master of the run-on sentence, and apparently, old curmudgeon

)