The other day I also told my wife the way she re-arranged the family room looked great when I didn't really mean it. It's not that it looked bad, I just didn't really care.
When I was a younger man, especially before marriage, I didn't get this... now older, though not old, I totally do.
If I can throw out a convincing, if not genuinely heart-felt, indication of my approval and that makes her feel good about the time and effort she put into something she obviously cares about and I totally don't, then I'd say it's all to the good.
I'm reasonably certain she does the same when I talk about bikes and biking.
When I'm tired though, I forget and will occasionally just say I don't really care either way. Oddly, she doesn't like that...
Cheers!