We have been for Memorial Day weekend before (Memorial Day started our 12 day trip). We avoided the parks on the Sunday and Monday, instead we went to DTD and resort hopped, and then on Memorial Day (the Monday) we spent the day at Typhoon Lagoon. TL was really busy, but we still got to ride all the slides and have a really great time. With that said, I would not hesitate to go that time of year again, we love WDW in Spring and like PP said before, it is before all the kids are out for Summer break.
As for Pop, we have never personally stayed there but we have visited it a couple of times (we really liked the food court). I would definitely stay there (and we are not big on the value resorts), love the theme of the resort, and it is a walk to AA where you can wonder around and get a ton of great pictures of the resort.