I've been to the Party for the Senses many times since 2002. As another person who went 4 times stated, it used to be a bargain, but the price went up, and seating was always less than it should be. Friends who purchased the Wine Lounge upcharge liked it, but I wouldn't spend extra for the guaranteed seats and the few extra perks.
I went during the same year that Kevin went. And I believe I was at the same exact night Nikki went (as we both saw Robert Irvine there). I can say that the year Kevin went, it was quite a nightmare because of the Year of a Million Dreams. Disney was giving out comp tickets to the event as Dream prizes, and it made the event overcrowded and unpleasant.
Since then, the crowds are not that bad, and yes, there are a lot of wines featured. I discovered that I can wander for 3 hours with the occasional seat without a problem. But if you have mobility issues, it will be a problem unless you can find a table or pay for one.
I intend to go to Party for the Senses again this year. Unless the price has gone up so much that they price themselves out of it for me this year. A few years ago, I was so underwhelmed by the changes to the special events, that a few friends and I did our own dinner at Victoria and Albert's instead. We paid probably about the same amount as a festival wine pairing dinner.