Well, don't listen to that realtor (the motive is obviously $$)! I LOVE living in Lamorinda..I'm originally from San Francisco so I like being with other Oakland/San Franciscans. Although there's a lot of wealth here (but not me

,) it's not quite as overt and ostentatious as Alamo/Blackhawk areas, imo.
My family did look into Danville at one point (but not Alamo) but it just seemed a bit homogeneous, and too far away from anything that makes me feel "at home" within the Bay Area. I think the weather here is some of the best in the Bay Area ..we'll often get the cooler mornings, then by 9am, the fog is gone and then it warms up and cools off again in the evening. I love it! (Danville probably doesn't get the morning coolness). I also like that it's semi-rural here. It's not like your typical tract house..plenty of older houses with more character (if that's what you're into). The roads are windy, the deer, wild turkey, even coyote are spotted all the time where I am.
As for the commute..25 minute BART ride. Driving...well..you know the story there..I'm sure horrible during rush hour, but much better into San Francisco than Danville. Berkeley is even closer..like 15 minutes (I like good food). Shopping/malls/parking lots are all 5-10 minutes away in Walnut Creek...brilliant! I'd say..fire that realtor...he's obviously lying to you. (I'm not bashing the other areas, but his assessment of this area is totally inaccurate)
Oh, and I am in no way "snooty"..in fact, I am now shopping at Target for my clothes! My house was built in 1960 and was built on top of a pig pen on my next door neighbors farm! Class!