Congratulations!!
My wife and I had our 22nd anniversary in June. From my experience the only difference between the first seven years and the most recent years is spending your early years growing as a team then benefit from that time later. There isn't less work, you just spend your time "fine tuning" your relationship.
I cannot imagine what it would be like without my best friend who has gotten me through some of the toughest times in my life. Lost jobs, sick kids, hospital stays, 9/11 ... the list goes on and on.