I would say do your research before you go and make sure it's something you want to do. We were there last week and everyone in the line had an ADR but quite a few left the line when they saw the menu or got fed up of the wait and as pointed out already on this thread, you are likely to be standing in a tiny space and we noticed more than a few people leave when they see they were allocated six inches of bar space each.
It wasn't my personal favourite experience in WDW and to be honest, it's the only time I felt a bit ripped off, but I wouldn't discourage anyone else from trying it if they really wanted to.
Also, someone on this thread said you don't have to buy anything but we were told there was a one drink minimum for every customer and you were absolutely not allowed in just to look round