I still catch an episode now and then, but it's long since ceased to be anything close to appointment viewing.
I've come around to the belief that The Simpsons continues to get renewed in order to keep the merchandise ecosystem alive. It's not a merchandising giant like other things in the Disney stable, but you still see a lot of swag out there.
If that's the case, whenever I see Simpsons merchandise, I always think of the Simpsons when they were at their peak rather than any of the new stuff.