I tend to play one weapon for a long time and sometimes I'll switch off of it to play something else for a few games. Occasionally I'll end up really liking the weapon I switch to and I'll start playing that instead, but it usually takes a while. So I have 4 stars on a whole lot of weapons, and only a couple 2 or 3 stars, and about as many 1 stars as 4 stars, mostly for getting licenses.
My 4 stars, in roughly the order I used them: splat dualies, tetras, squelchers, squiffer, liter, splash, ballpoint, shot, pencil (while it was considered one of the worst weapons in the game), rapid deco, z+f, s-blast (91, obviously), nautilus
More recently, I've found myself going back and using my "old" mains more often, but it's less because of the map mode and more because I feel like it. and I still mostly play one weapon at a time