I am a recovered simultaneous bilateral THR, May '05. For me it was a great way to go, but there are lots of things to take into consideration.
Not all surgeons will even do them, and the ones that do tend to have some pretty strict criteria. I had an outstanding, highly skilled surgeon that was a miracle worker for me, but he does not do simultaneous very often. His criteria included being young (I was 53), lean/strong, motivated, and have great home support.
The surgery was long, over 4 hrs, but I was able to recovery very quickly and home in 2 days. I was very fit before my surgery and spent the 2 months I had waiting doing a LOT of weight training to get as strong as I possibly could be. I worked very hard at my PT, but I was able to return to work and play in a very short period of time. Today, you would never know I have 2 artificial hips. I am very active and they do not slow me down in any way.
You really need to discuss this in length with your surgeon. If he/she is ok with it, it can be a great way to go. Best of luck to you!
Andrea