I used to post on the old forum with a different login, but it no longer works for me and I'm going to be posting here for the first time in a while.
I had my spleen out in August 2009 when I was 20 and my platelets have been high ever since. I was put on baby aspirin for a few months and that brought my platelets down to high-normal levels, but I haven't been taking them for a long time now and my platelets are still fine (although a little lower than they were). I only had ITP for a few months before getting a splenectomy, but it was recommended as the next course of action after prednisone and Decadron by both of my hematologists. One of the additional reasons I got the splenectomy before my junior year in college was because I planned to study abroad and engage in various other activities. Treatments like Rituxan weren't recommended for me, but I also didn't want to be tied to a weekly treatment with a relatively low chance of success right before a semester abroad in Europe.
After I got my spleen out, it took me a long time to recover because of blood loss during the surgery (I had taken steroids right before but there were still some complications), and I had to do most of the recovery during my first semester of junior year. I was absolutely paranoid about getting sick during this time, especially because I spend one night of every week sleeping on filthy dorm room floors for debate tournaments at schools around the country. This was also right at the height of the swine flu scare and my roommate wasn't careful at all about maintaining her health (she ended up getting swine flu and I left our room for four days and didn't come back). I wasn't prepared to give up debating or to switch rooms, but I brought hand sanitizer EVERYWHERE, was more careful than ever about keeping my pillowcases and laundry clean, carried a thermometer with me to make sure I wouldn't get a fever unawares, etc. I also became way more about vigilant eating well, getting a full night's sleep during the week and avoiding schoolwork-related all-nighters and I also completely quit drinking for a time (although I'd never been much of a drinker anyway). Surprisingly, I didn't get sick during that semester even though I had typically gotten colds every single other year during November or December. I then went abroad to Germany (with just-in-case antibiotics in tow for my periods of travel to other parts of Europe) and was also healthy, but I did struggle more than ever with seasonal allergies and also got my first sinus infection. I've gotten my allergies under control since then after two recurrent infections, and other than that, I have not been sick or even feeling bad much at all since the surgery.
I do think about getting sick a lot and I'm still extremely cautious in most ways, but I've found that committing to a healthier lifestyle has really helped me. I keep my allergies under control, exercise and eat well, and avoid getting sick as much as possible. I've made some changes, such as getting my flu shots and studying in my room instead of the library full of coughing college students, but they've been minor and easy to deal with. I do occasionally have health questions that may be related to ITP (such as a strange and small rash I've been sporting for a week now), but on the whole, I'm healthy and I had a fantastic semester abroad and I don't regret getting my spleen out at all.
I hope this helps! I'm now 22 and I've been without a spleen for almost two years now - here's hoping for many more healthy years without any relapses.