"So if you use your camper about every other week, wouldn't you be running them in MORE often than if you just left them out when you get home from a trip?"
Well, I put my slides in when I travel, but that's just me!
But I understand how some need the slides out to load, as many campers are not set up very conveniently. Luckily, on ours, the fridge and all of the storage is readily accessible even with the slides in, so we only put out the slides at the campground.
The only exception is when we put it away for the winter in our heated shop, then the slides are extended and we put braces under the superslide. That does two things, it takes the load off of the slide mechanism, and also decompresses the inside slide seals.