If there really are fewer places to sit and you are consistently noticing the issue, please tell Disney. They're not heartless monsters over there. People who are relaxed stay longer and spend more money. Satisfied customers tend to keep spending more and come back again or future visits. But if you are spending less and are less satisfied, let them know!
Soon, guests can be part of a new bench pilot program, starting at MK and expanding out. Disney will soon bring back new MM+ benches with a FP+ scanner on them. You can reserve a spot 60 days in advance as an on-site guest. For example, let's say you plan to be tired on Thursday afternoon. You can reserve a bench from 3:15 - 3:30pm as one of your FP+ selections. Once you've used up your bench fastpass, you can actually add a fourth bench fastpass for later that day when you'll be tired again!
Reserving a bench just became fast, free, and easy! And best of all, it's included with your on-site resort stay. Note: standby service is still available at park benches, but be prepared to wait!