We did the party on May 23 and actually quite enjoyed it. Now, we did stand in line for a while just to make sure we got a good seat, and the organization of the staff was a little lacking on the timing front. They said they would begin checking people in around 8:00, but that did not happen - it was probably 8:35 or so before they started giving out wristbands. The only plus to this was that then we got to go basically immediately to choose our tables. We had a small party of three, so we chose a great table right against the railing in front of the castle. The buffet was open immediately as well, and we had a couple of trips before anything even got started. We had a decent view of the Electrical parade, which was a nice surprise as well - I hadn't really thought about the fact that it starts while the desert party is going on.
There were a few other families in line with us at 8:00, but not a whole lot. I think you probably could have shown up a little later and gotten a pretty good seat. We enjoyed most of the desserts - the cupcakes are nothing to write home about, but the rest of the items were very good, and we had more than plenty.
If I had wanted to do more attractions, I think I would have been a little annoyed at having to get to the party so early to "make sure" we got a good seat. This was our first time after the changes, and the first (and potentially only) time my mom would go to the dessert party, so I was invested in getting a prime table. At this point in our trip, it was our last day and we had been kind of winding down anyway - my husband and I split some corn dog nuggets from Casey's so we didn't just have sugar for dinner, and then we just got in line to wait for the party since we weren't really up to trekking around the park any more.
Overall, I think it was worth it for us to be able to give my mom a special experience. We all enjoyed the food and the view a lot. This was definitely expensive, and I don't think it will be a regular thing, but I enjoyed the party and was okay with the price. I know this probably makes us a bit of a minority, but I thought I'd put in my review here anyway!