I've been thinking about this since you posted. I can imagine getting burned out by pet care, and have tried very hard to limit the number of animals I have. Every time I think how nice it would be to have a dog or cat, I remind myself that it would almost be like having a child! I don't mind the daily care of ONE lizard, but more would become tedious. The toads and turtles just get fed two or three times a week, and the torts don't require any care at all, except maybe throwing some flowers in as treats. The snakes are in two groups- the five day feeders who all eat reliably. I don't mind them- their food thaws in minutes and they are done eating practically before I can wash each snake's water bowl. They are funn to feed- so serious with their little tail rattlings. Charting their weekly growth. It's the grown up snakes that can be PITAs. The males are on hunger strike. You never know if they are going to eat or not, so you have to have a back up snake that eats the same size prey, and you have to thaw it out, get the snake out, give it a decent amount of time to refuse, reheat the prey, get the back up snake out...THAT is what gets me. Can't they just eat?? And there are more of them that want to be covered up, or want to eat after dark, or whatever. And they can take a while to get started eating- they have to think about it for a while. I can see if you had 20 or 30 or more of those picky suckers, instead of the nine I have, that it could get old.
I think other people, spouses, kids, weigh on you, too, no matter how much you love them. They require your time, to a much greater extent than the pets. When you don't have them (well, my daughter is long grown up and gone off on her own) you have virtually unlimited time for yourself, so the pets aren't taking away from the precious few hours you may get for yourself, away from your family. And it helps to have a 9-5 (or 6:30-3 in my case) job that you can walk away from at the end of the day, not work from home, or take work home with you.
Anyway, I hope it all clears up for you, that somehow they become less of a burden.