You have my sympathy, I had a wisdom tooth removed when I was 35. Like you described, it took quite a while for the indentation in the gum to close up. I think that as we get older, it takes longer for our bodies to heal themselves.
As regards tests to discover if your other teeth have moved, I`d say go to your dentist if you have pain or problems. An X-ray would show up potential problems too. However, my [very good] dental surgeon told me that yes, teeth may shift a tiny bit over a period of time, depending how much room there is in the jaw to allow movement.
I hope this helps? Good luck - Yetta