While I have not had 'treatment' there, I can say the lockers at Saratoga Springs are great.
At one time, if you were a DVC member, you had access to the spa locker rooms. Technicaly you had access to the gym, and because of that you needed a locker room. On my last day of a vacation, I like to hang out by the pool. I put some 'street clothes' in a gym locker along with some things like a hairbrush - but no gels or liquids because of TSA rules.
SSR was great because the spa locker room had showers, soap, shampoo, deodorant, toothpaste, toothbrushes, combs, fresh fruit, towels, robes, a wet sauna, a dry sauna, a hot tub, beverages, and a bathing suit spinner.
Now the only way you are allowed in is to actualy have a treatment scheduled. Instead they built a small set of lockers, a single shower, and a bathroom downstairs for people using the gym. It does the job, but it's nowhere near as nice.
-dave