There's something to be said for having just a few competent
firearms, and the skills to use them.
Your original list (30-30, 20 gauge, and a 45 pistol) would seem
to make an excellent collection for pure survival needs. (One
might argue that a .22 would be a useful addition, but that's
kind of beside my point.)
I actually find I've got a few too many toys, so my familiarity
with some of them is not real finely honed. For part of my collection
that doesn't make it out of the gun safe that often, I find that
I may occasionaly fumble with the location of the safety, or
forget the odd quirk that this or that gun may have. (Mossberg
20-gauge pump with an annoying tendancy to trigger the
safety back to "on" after a couple of shots, that sort of thing.)
Don't know the source of the quote, but "Beware the man with
only one gun -- he probably knows how to use it."