I have a bunch of bows...some collectors, some shooters, and some for sentimental reasons.
Three years ago I was lucky enough to kill five deer with five different recurves and longbows. I practiced with those bows, felt comfortable with them, and most important, took very close shots in order to insure success. It is not typical for me to use that many bows in a season as I do think it is difficult to switch between multiple bows.
What is typical for me is to pick a few bows to start practicing with in the Spring. After a few rounds with each bow, I decide on two bows to become my primary and backup for the season. They have to shoot the same arrow, have the same "feel", and have the same cast. That way, I can confidently use my backup bow if necessary without adjusting my shot or grip.
Claudia