Totally love it. Pilot on ABQ-MSP pointed out some NM features, including the continental divide, earlier this month.
It's great not just for Americans, but for tourists, who might fly over America rarely. This is such a vast and beautiful country, it's really wonderful for the pilots to share their knowledge with those on board. Pointing out views of cities and aurorae are great too!
Most memorable was when I flew SFO-SEA and saw Mt St Helens, which inspired me to climb it a decade later. Also memorable was a UA pilot who specially requested the Rainier departure so that passengers on the left side could see Mt Rainier, and passengers on the right could see Mt St Helens.