We just got back last week. We were there from 3/5-3/12.
I found it to be of very little use. The main problem is that everything, other than user posts, is nothing more than an "estimated" wait time. Often, estimated times would be 20 minutes, then the actual posted wait time at the ride is 50. What was really annoying is that even after someone posts an actual wait time, the estimated time is not changed. Also, often, there was simply no recent wait times posted for many rides, leaving you only with estimated times.
On the other hand, at times, it was very helpful, if there was a recent user post.
That said, I continued to check it between rides, just to get an idea of where to head next. Just had to be prepared to get there and find something totally different than the estimate.
I guess I would use it again, as it is at least a general idea of what rides may or may not be crowded.
There is a free app somewhere out there. I spoke with a lady who was using it, and she reported it was very accurate and helpful. She also admitted to posting fake times on a ride the day before.