I almost always stay at the Swan (first choice) or the Dolphin when visiting WDW. My feelings about staying at the Swan/Dolphin vs. a Disney-owned resort are similar to my feelings about cruising without the MOUSE: fewer kids and better prices!
1. You certainly
can get packages delivered to the Swan/Dolphin, and their guests can take advantage of Extra Magic Hour at the theme parks. It's true that you can't take Magical Express to and from the airport, and Swan/Dolphin guests can't purchase the
Disney Dining Plan. However, the Swan/Dolphin recently started their own dining plan.
2. The Swan has refrigerators, and the mini-bars at the Dolphin are in the process of being replaced by refrigerators.
3. If you can swipe your KTTW card in the parks to pay for purchases, you can swipe your credit card, too!
4. The Swan/Dolphin use the same boat and bus transportation as the other Epcot resorts. They share a bus to the MK and AK with the Boardwalk, whereas the Yacht and Beach Club have their own bus to the MK/AK. If you don't like the Swan/Dolphin's transportation options, then you won't like them at the 3 Disney-owned Epcot resorts, either.
5. Beds - Heavenly!
6. I get plenty of Disney-ness in the parks, and I don't need Mickey wallpaper border or wake-up calls to remind me where I am.
7. I think the Swan and Dolphin are cool looking. I've heard people say the Swan/Dolphin don't "fit in" with the look of the other Epcot resorts, but the Swan and Dolphin were there first!
8. I prefer the more adult atmosphere of the Swan/Dolphin.
9. While I'd prefer not to pay a resort fee at the Swan/Dophin, you'll pay for internet access, telephone calls, and bottles of water if you use them at a WDW resort.
I'll stay at the Wilderness Lodge for the first time when I'm at WDW in December - due to a great rate and a roommate to split the room cost.

I'm really looking forward to being there at holiday time, but I know I'll miss my beloved Swan and the convenience of walking to Epcot - where I spend the majority of my time.