I think, aside from its richness (which I agree is abundantly present in Mass), the reason why your husband loves it as much as he does is because of you.
Mass is public, community worship of God. At least once every week, we Christians must get together to worship the Lord. It feels good when you worship in a close-knit community or at least with someone you feel close to. This helps the Sunday Obligation go over well, as well as the daily struggles of the Church Militant. A spouse, a close friend, or a family member helps a lot with this and makes the experience even better.
I have no one to go to church with. I’m the only Catholic in my family and most of my friends are either non-practicing, another religion, or Atheist, so my definition of “church” is different from everyone else I know. I’m the type of guy to shy away from community religion, as I prefer to practice in private. Maybe I just need to get over my “religious introversion” and reach out to my Parish Community.