Agree, the 7 day ticket is just a gimmick to make people stay longer. You really only need 3 full days to see USF/IOA.
A few people have visited taking their time, hanging out at the pool, going super slow. That can be done, but I'd say you'll want to visit SWF, BGT, and WnW.
The other thing is you don't have to spend one day at each park. You can visit one in the morning, then visit another at night. Having the 7 day ticket gives you the option to visit when you want. For example, you could drive down to SWF in the morning, stay until noon, come back to the hotel to rest, then visit IOA for the evening.
The onsite hotels have a shuttle to SWF and WnW. The only negative is they don't leave early, so you'd arrive SWF around 10am, and your early morning advantage would be gone. But if you're taking your time, it will still work out. A few people have taken the free shuttle to SWF and reported the crowds for Kracken and JTA were light.