The S/D is our favorite resort. Every now and then we'll stay elsewhere just for a change (btw-that will usually be WL or the FW cabins).
To start the rooms are comfortable. You can request connecting doors since you're all together. Most times they will honor your request (unless they're really booked-but they usually can block out rooms at the time of the reservation).
Many of the rooms have great views. I too was a bit intimidated to stay at the Dolphin after staying at the Swan many times. But, once we stayed there I was pleasantly surprised. I wanted to stay there several times after!
The Swan is completely renovated with the heavenly beds and the rooms look quite nice. The Dolphin is in the process of being renovated with the same type of decor. The Swan has 2 queens or a king, with an extra sink area. The Dolphin has 2 doubles (which are oversized just slightly smaller than a queen) or a king with a vanity area instead of the extra sink.
You shouldn't be overwhelmed with the Dolphin's size, the set up is still convenient. If you stay in the west side of the building you will be closer to Tubbi's (the 25 hr buffeteria) and the pool.
The Dolphin is very lively and fun. If you prefer a more intimate atmosphere then you might want to try to Swan. But, there is not a Tubbi's type restaurant in the Swan.
Both resorts are in the middle of everything. You will not feel isolated at all (I feel a little isolated in the WL/FW area). You can walk to EPCOT and MGM or take a boat. The bus will take you everywhere else and IMHO I think the bus system at the S/D is better than the WL.
All that being said, wow, I said a lot too...we love the S/D and highly recommend it. We have always found the CMs to be extremely helpful and very friendly. Yes, there are conventions here, but so what, to us it doesn't take away from any WDW magic
