I recently returned *sigh* from an amazing trip with my boyfriend to the World. We stayed for the first half of our trip at the Hilton Orlando, located close to Sea World and the second half at the Doubletree Suites by Hilton on Hotel Plaza Boulevard (within walking distance of Downtown Disney). We stayed there because we thought the location was great, I also had a discount to stay there and we heard about the transportation to the parks. Now, yes, the location was great for DTD shopping, but everything else left much to be desired. The staff was quite aloof, the rooms and the hotel look like they haven't been updated since the 90s and the pool was really sad. There were leaves and sand all along the bottom of the pool and hot tub. Not surprisingly, we did not once see any guests in the pool or hot tub. The front desk also boasted a pool side bar. We tried to visit it several times, but it was never open.
I would definitely suggest trying one of the other Hotel Plaza Boulevard hotels over the Doubletree.
On a side note - the Hilton Orlando was incredible!