Over the course of 20 trips, we've stayed offsite in villas, offsite in hotels, onsite at Disney and onsite at Universal. We've done entire trips offsite and entire trips onsite, as well as many split stays. Each has its own advantages, but if I was forced to choose, I'd say I probably prefer to stay in a villa, with a few nights out onsite part way through. I like being able to throw a few things in an overnight bag, rather than having to pack up completely and move on to the next place. Maybe that's an option for you? Why not look at a night in a Universal resort for two days' FOTL access at the Universal parks?
The more I talk to friends and fellow DISers about the whole onsite/offsite and/or hotel/villa thing, the more clear it becomes that most of us have a very specific notion of what the Orlando experience is for us and, usually, it's what we're accustomed to. I love WDW, and whilst I don't hate being surrounded by it 24/7, without a doubt, I prefer getting out and about. It's what Orlando is for me.
What I love about hotels (not just those onsite) is the ability to shower and change in the evening, walk down for drinks at the bar and then on to dinner. Of course, we still go out for meals when we're in a villa, but it needs more planning and is nowhere near as leisurely an experience. And I hate getting all "creased-up" in the car. Afterwards, too, it's so much more civilised to just be able to stroll back to your room, rather than having to wait for a cab. Having said, that, we wouldn't spend 2 or 3 weeks in Orlando and just eat at our own hotel, so it's a moot point.
However, I find a villa far more relaxing at the very end of the day. You simply can't veg out in a hotel room in the way you can in a villa. When we get home in the evening, be it from a park or dinner, we love chilling out playing pool, taking a dip and relaxing in the jacuzzi. I enjoy the space and privacy - for us a hotel room feels very confining after a few days. I never use hotel pools or jacuzzis, but I'm in them morning and evening when I have my own. Having washing and drying facilities means we can take less in our suitcase and go home with a suitcase full of clean clothes. Using hotel laundry facilities is such a drag. I love staying in fabulous homes and living the dream for a few weeks each year. Making my own bed and cleaning the kitchen are not chores for me when I'm in them. Quite apart from all the practical considerations, though, the best laughs we have on holiday, no matter who we're travelling with, are when we're chilling out around the pool, or playing pool in the games room.
