Here I come to defend them again:
1)Benches take up walking spaces, and in a lot of areas where there used to be benches, they need the space for foot traffic.
2) People have tended, from time to time, to lay claim to benches for long periods of time during the day.
3) in some cases, people have been known to stand on them to get better views of whatever.
If I'm not mistaken, a lot of the benches around the hub were taken out, but they were replaced by high curbs that can serve the same purpose as a bench, but for more people.
While it's a fun thing to say, I seriously doubt they took out benches to get people standing in order to get them to buy stuff. Like everything at WDW, it's more a function of bigger crowds than anything nefarious.