I had the hamstring graft which has slightly different implications for the rehab – I needed to do a lot of work on the hamstring. As I understand it the patellar tendon is very painful at first, but avoids some of the problems which come with slicing a lump off your hamstring.
As a few other posters have said, the key to any recovery is the rehab you do. Mine was gone for a couple of years before the op, I did plenty of work in the gym, and it was definitely worth it for me getting it fixed – it is much more solid.
There is a big stigma on here about gyms being boring but they really aren’t. If you get the right physio and learn about developing good functional strength, core strength, and flexibility, you can take a lot of positive out of a 6-month stint in the gym. Try and find the right physio and get them to build you up to some free weights and kettlebells. The bikejames website has a lot of good exercises and there is a good core workout with liam killeen on Youtube, which somebody else posted up before. Everybody has physical limiters on the bike that they can improve dramatically in the gym.