my doctor prescribed 9 weeks of PT rehab (3 x 3 weeks in-home PT and 3 x 6 weeks out-patient PT). both times, i stopped the out-patient rehab after 4 weeks mostly because i was doing well, promised to continue rehabbing on my own, and had to get back to work/life. if insurance will pay for PT, then i think everyone would benefit from it. if i had to pay 100% of PT, i still recommend it but suggest finding a PT that offers a discount to self-pay people (i had to do this for my first hip) but maybe only pay for once or twice a week (as there are many exercises you can do on your own).
for me, the PT was good to get a list of suggested exercises from a human being (rather than the internet, no that there is anything wrong with getting information from the internet), learn the correct way to do each exercise, and to have a sounding board with some expertise to provide progress comments along the way.
although not connected to hip resurfacing, a friend who does speech PT rehab (stroke patients, etc) said that often the patient would likely recover their speech on their own but the PT just speeds up the process. i assume pretty much the same can be said for hip PT rehab.
so, for me, i would highly recommend it.