> Riding trains is great, getting to the train station(s) in a busy city, worrying about the schedule and being in the right spot for the right train, etc, is not at all fun.

I'd say that, in the majority of cases, it's either no more difficult or outright easier than getting to an airport, as airports tend to be located on the outskirts of cities (requiring connecting train/bus service or private cars), while most rail hubs tend to be in city centers.