As far as activity, yes I am the same way. Once I started something I always wanted to stick with it. In school I'd walk up town and buy the same food and drink every day, others used to criticize me for it. Listen to the same music, same seat on the bus. Order the same few things off the menu no matter where I go to eat and sit at the same seat, or eat basically the same few things all the time at home. These days it's pretty much the same, even the keeping of routine is a routine. My cars, phone, appliances, TVs, satellite, computer, sound systems and music, furniture, house, job, bicycle, etc, etc..... All the same. Places I like to visit are all the same too.
Thing is when I do discover something new that I actually like, I get all excited and want to make that a routine too. A road I'll travel over and over. Going to Save A Lot downstate after dropping off my daughter, getting the same food for work lunch, then going into the store bathroom that smells like the water is pure bleach, in the hour before they close on a Sunday night so I can savor the chlorine without being bothered. This winter I started eating my lunch at the gas station and now the people have learned my routine quite well. Back nearly 15 years ago this one worker knew my routine because someone asked and heard her say "oh he orders this and this and this all the time, made this way", she had it down to a science what I liked and what I didn't.
Then it gets interesting with say a campground I'll keep going back to, because I'll be pulled in two different directions worth of aspie traits. Part of me wants to keep using the same site over and over as routine, the other part wants to stay at every site in the campground because of the obsession to discover and experience everything possible about the place.