I was about to argue that 9 of the movies, TOS, Voyager and particularly Enterprise had a Vulcan (or half Vulcan!) in almost every scene, but actually you're probably right: in comparison to Klingons, Romulans, Bajorans, Cardassians and Borg, we spend relatively little time looking at the homeworld or the culture itself, beyond folk meditating, shagging at proscribed intervals, playing discordant music and being quizzed by disembodied voices. Maybe that's all they do!
In other news, watched Trouble with Tribbles with the kids last night, they rolled about laughing at the 'Klingens', as they appear to be called by most. Couldn't help myself shouting 'Remain Klingon!'* whenever Koloth was looking and sounding paticularly human. Damn fine episode, though.
*Which I recently discovered is 'Fan Tliongánach' in Irish, thanks to the superb @theirishfor.