Do you consider camp casting cheap/an exploit?

I'm near the end of the game and I've started dicking around with camp casting, but I'm of two minds about it. On the one hand, it's a tool the game gives you and clearly allows... on the other it feels kind of cheap.

I started doing it just to minimize how often it's necessary for me to take long rests to recharge spell slots, but it didn't take long for the munchkin in me to realize things like "if I summon all my summons in camp, I can give them all Aid and Heroes Feast without burning a functional spell slot!" and now I feel like a dirty power gamer.