Unless you go during a busy time, most of the slow rides only have a 5 to 20-minute wait.
We just came back from WDW. Rides like Figment, Living with the Land, Space Ship Earth, Nemo, 3 Caballeros, Small World, Mermaid, People Mover were walk-ons. Pirates, Mansion, and Winnie had a 15-20 minute wait.