I was a hardtail only guy. Then longer travel full suspension bikes got a lot better and lighter and more reliable. I kept my hardtail because I loved the idea of riding it, but now I’m used to riding a full suspension bike I find I never enjoy it as much unless I’m on the right trail. The right trail usually means riding something less exciting at a slower pace, which isn’t really why I enjoy riding a bike.
You will enjoy it, it’s a bike, bikes are fun and as a change it’ll be great but if you’re used to full suspension you may well end up hankering after your old bike after a while.