Yes, actually it is a downsize.
I expect our quality of life will improve .... less room area to furnish and keep clean and heat, more efficient heat and insulation, lower maintenance, smaller yard, no in-ground pool to run, etc.
Our monthly "burn rate" should drop quite a bit. Plus, it is a good opportunity to start fresh, with reduced services (cable TV, land line phone, etc).
Being over 60 yo now, I am looking forward to my weekends freeing up from yard and house maintenance. More local travelling and activities (biking, hiking, etc).