M'Lady Wolf and I live in a 32' motorhome with a slide. For us, the slide makes all the difference in the world. We pull it in to make our propane runs and always heave a sigh of relief when we get back and deploy it again. I work full time and we've been in the same place for just over a year. Sometimes it feels cramped one one or both of us pull out our tools, gear, what have you until we put it all away again. I can't say the wife makes it feel crowded- in fact, the place feels empty when she's away visiting for a few days.
What makes a big difference for us was floor plan and slide. If I had to choose between a longer motorhome and no slides and a shorter one with at least one slide, I'd choose shorter & slidier every time. If I could figure out how to add another slide to ours, I would! We spend a lot of time inside especially during the winter. During the summer, we're inside because our awning is broken and I don't have the funds to get it repaired or replaced.
We have no pets and I'm not sure how we'd handle a dog or cat at this time