I also went last year to the brunch at Epcot. By far the BEST dining experience and food we had the whole time we were at WDW! OMG, the food was great, and so many choices. The "princes" were all wonderful, it was relaxing, VERY nice.
Oh, and I've been to lots of brunches at various hotels and restaurants. They have all been very good experiences. Mother's Day brunches are always special meals.
~Mary
P.S. Wherever you are planning to brunch that day - make your reservations EARLY!!!