we lived in the bay area for 10 years before moving to Los angeles for 4 and then here to CO for 2. let me say that denver isn't the bay area. there are big differences. were we still dual income no kids, we'd probably still be in the bay area or LA.
here's what I miss (many have heard me whine about this before): Ikea, Trader Joe's, easy and endless farmers' markets, organic food everywhere, easy vegetarianism in restaurants. I'm a progressive so I miss the endless other progressives everywhere, the racial diversity that you didn't have to work to find, stay at home dads

, the many different constructions of "family", many independent bookstores, lots and lots of museums, fantastic restaurants, awesome shopping, gender neutral shopping (I'm shocked when I see ladies' night at a firestone tires-wtf?).
Here's what I love about colorado: cheaper prices on most everything, people are friendlier (initially it was rather frightening), every restaurant seems family friendly (no need to call ahead ), kids still play on the street-no need for organized play all the time and playdates!, the wildlife, the clean air, did I mention the fact that I can buy a ton of house here for a song, or at least what seems like it after CA, the schools are pretty good to excellent, the libraries are awesome.
employment is iffy I think, but we moved out here with a job (my husband transferred with a job).
I love colorado but I do miss much of my life in CA. If I had to do the move again I'd do it in a second (I'd just buy more stuff at Ikea and Trader Joe's beforehand

). Unless something drastic happens, we're here in CO to stay.