Onsite, you can wait..... and wait..... and wait............. for a bus.
Maybe it depends on where you stay? Or maybe what your definition of "wait and wait and wait" with lots of ellipses is? My last two trips I've stayed at POP, and I rarely recall waiting more than 10 minutes for a bus. And I can guarantee that I got to the parks faster than someone staying off site and waiting for a shuttle - most of which only run on scheduled intervals or might only drop off at the TTC. And yes, offsite, most people probably have a car, but that's either a rental ($20+ per day plus gas) or it's your own, which means you drove to Orlando (something I can do, too, but it would take me 3 days).
Offsite you can walk to your car or hail a cab and get back to your room.
You can hail a cab if you're onsite, too. You can rent a car or drive your own if you're onsite, too. Being able to call cabs or drive yourself is not a "benefit" or advantage of being offsite.
Most places offsite have drinks. EMH is not all that fabulous.
Drinks?
And I love EMH, getting to mill around the parks a couple extra hours at night, which is my favorite time. Epcot until 11, MK until 11 or 12 during the slow season when the parks would normally close around 9 is a wonderful benefit for me. Even if there are lots of people and still some long lines, I love being able to spend more time walking around at night - it lets me hit the attractions harder during the day, knowing I'll have those extra two hours to soak up the evening atmosphere at the EMH park that night.
But all of that aside, I stay onsite mostly for one reason, and that's because I feel like staying onsite is an extension of the parks. I might only get to go to WDW once every 3 or 4 years. I wouldn't dream of spending that time anywhere but in the heart of the magic. I feel so much more special at a WDW resort than I do in any hotel I've ever been in, and I've been in a couple really expensive hotels that were nice, but still didn't give me the feeling I get at a Disney Value resort.
We are DVC members and if I'm out of points and want to go to Disney, we'll stay at the S/D, Bonnet Creek, or a Uni resort. All 3 are better deals and the Uni onsites are nicer than the WDW deluxes.
Seriously, now? I've seen the Universal resorts. They're nice. They're also not nicer than the WDW deluxes.
The 2 queen bed rooms at the Portofino Bay (see pic below) are barely = WDW moderates. FQ's or POR's rooms are nicer. And it certainly does't compare to Poly, AKL, WL, GF...
I just now priced some rooms: Compare a $282/night Portofino Bay room to a $232/night room at POR, for the same dates in October:
Portofino Bay Garden View ($282 inc tax)
Port Orleans Riverside Royal Guest Room ($232 inc tax - A river view room is $265 inc tax)
Here's a great video overview of the Royal Guest Rooms:
http://www.youtube.com/watch?v=J7sFvDptu-s
Nicer than a WDW Deluxe? Seriously? Yes, Universal has their deluxe suites and whatnot that are better than the $280 rooms at Portofino - and some of them are upwards of $1,000. Is that really a better deal than WDW's Deluxes?
Look, I understand why people stay offsite. For many, it's simply a much better value. I consider it an
incredibly smart decision if cost is a concern, because spending less money on your hotel means being able to stay longer and see more during your vacation. And for some, they're not fans of the theming of the value resorts. I totally understand it. But you don't need to justify staying offsite by exaggerating the bus wait times, implying that EMH has no value, or that Universal's onsites are some great bargain or nicer than WDW.
Admire the details outside of Beast's Castle.
" pot? You cannot. I have a friend who can buy and sel; all of my worldly goods several time over, and she would no more stay in a WDW resort than she would perform her own root canal. Not her thing. Period. Disney found a way to capture guests lodging and meal money but their resorts and restaurants often leave families with more than 4 people compromising a lot in order to stay onsite. Let's face it, WDW are convenient, but for many families, those over 4 people in particular, they have nothing to offer that would in any way justify the cost. 
