Congratulations.
I'm approaching my 2 year retire-a-versary (July 1). The biggest (and best) surprise is that we haven't had to dip into our retirement savings. I had planned a monthly withdrawal of almost $3000/month, but so far we have lived comfortably on SS, pension, and book royalties. It's been a combination of higher royalties than expected and lower expenses.
The next biggest surprise is that my time isn't as free and flexible as I expected. It's my own doing, because I have committed to Honey-Do's, family activities, and volunteer work, but I was hoping I'd be able to take off on a 3-hour bike ride any time the thought crossed my mind. Didn't happen. I don't want to change this "problem," because I'm comitted to certain personal and family goals, but it is a mild surprise.
Actually, all is going well.