True story - my dual income no kids household has a toyota sienna. It is, in fact, the exact same sienna my mom drives in a different color and with slightly upgraded features.
My boyfriend was EXCITED to get a minivan, we both grew up with one so we know how sweet they are for practical things. We took 5 people to tahoe with ski gear and luggage for a week. Its the best thing for moving most things - just cant' use it for larger furniture, but at a certain point you just need a uhaul. My mom loves hers, she uses it for transporting plants, dogs, etc. Actually hers has 3 of the seats basically permanently removed at this point.
To be honest though, we probably wouldn't have bought a minivan over a little sedan - the gas mileage is certainly a lot worse and they cost a lot more brand new. But my friend's stepmom was selling hers and they offered to give it to us for 1500 off bluebook and we were living with only one car at the time. But they are REALLY convenient and we certainly enjoy having it, both for the space and for the ability to put 5 full grown adults in a car comfortably with bags and whatever else, and we get to make large purchases on a whim and stuff. I'm the only person among my coworkers wiht out kids AND the only person with a mini van.