Nook, midpack, neverbored - your posts hit exactly home with me as I proceeded you just slightly - I've been retired for about 3 weeks now.
I got choked up at work several times and I didn't want to do that. They had a party for me that I also didn't want and asked me to speak. I kept it short, sweet and positive, so no tears there. I did go to several lunches and those were all fine. I had the mixed reactions from co-workers too - from those that were truly excited and happy for me - to those that were kind of pissed that I was running away from problems (which I partially was, but I didn't cause them). I imagine that is true for most ER's - if life at work was just a dream, why would you take this step?
Since I ER'ed, I've seen some things that I didn't expect, too. The first day at home I had periods of sadness and excitement. It felt strange to not be constantly looking at the smart phone. I couldn't just sit and relax since it felt like I was supposed to do something, or I was worried that maybe I had made a mistake. But it was pretty amazing that on the second or third day, I totally disconnected from anything related to work - and it felt great! Just yesterday, I realized that I had not talked to anyone from my old employer - a few emails, but no verbal communication. I did not intend to do that. So I called two of my old friends, and we talked for about 20 minutes.
Keep the faith. If you have done your homework and are comfortable on the financial side, you will enjoy ER. Maybe not all day, every day - but overall, it still feels good. For me, this is something for which I have planned for 25 years. Actually, I wanted to ER at 50 and worked to 54, just to be sure.