Hey Jps,
Yet another bilateral Dr. Gross patient chiming in here (maybe this thread can be dominated by *all* bilat patients of Dr. Gross!). I'm almost 9 months out and haven't used any physical therapy to date, and it's unlikely I will. Would I have benefitted from PT during my recovery? I'm sure to a certain extent. However, I can guarantee that PT isn't a mandatory component in your healing. It may speed up the progress of regaining some strength and flexibility though.
As Quig stated, you will get much of your control back very quickly in terms of everyday activities. If you're doing one hip, you might find yourself feeling "normal" while walking in a mere 2,3 weeks. And as Blinky said, you want to avoid an overzealous therapist not accustomed to this type of surgery, and one who might push you beyond your restrictions.
Having said that, there is no reason you couldn't benefit from using a physical therapist. During your recovery, you'll know how your body is healing, and what areas you might need to work on. For me the glutes was/were the body part that needed the most attention. Having a professional show me different ways to strengthen these muscles would have helped for sure.
Good luck on your upcoming surgery! Your in great hands with Dr. Gross and his staff.