My Traverse is 2.75 yrs old, has 50k miles on it, and has NEVER been in the shop.
I cannot tell you how happy we are with this vehicle - it's almost supplanted my beloved Expedition as my favorite car of all time. When we were car shopping, we looked at the Traverse and the Mazda CX9. The Traverse had a roomier front, the option of captain's chairs for the second row, and used regular unleaded gas (the CX9 requires premium). Dh preferred the Mazda (he's had 5 so far), but I was happier with the Traverse and the cost of regular gas. The Mazda was slightly cheaper.
We have driven the Traverse on multiple 400 mile round-trip trips. It's been to Disney (KY-FL-KY) once. It's getting ready for a 9 hour drive to VA. It's commonly stuffed to the gills with boy scouts, who still fit easily into the 3rd row seat at 5'6" (and that's why I wanted captains chairs).
As stated above, the only things we've done have been routine maintenance. It does require a $75 synthetic oil change 3x a year in order to keep the power train warranty in force, but that has been the only expense associated with maint. I did upgrade the floor mats to the heavy-duty rubber mats (about $300 for all 3 rows) and we added a trailer hitch ($250). We don't tow, but we purchased a hitch basket ($250) and a couple of locking boxes ($75) to have room for luggage for 7 when the third row is in use. There is room for several backpacks / duffle bags behind the third row, but definitely not enough room for luggage or camping gear if the car is completely full. It will cost a fortune to replace the tires (priced them at $275 ea when I bought the car), but at 50k miles, my tires are still original and in very good shape. I get them checked and rotated every oil change.
I would definitely purchase this car again, and I highly recommend it. The only cons I have heard from another owner is that the 2nd and 3rd rows do not recline, making it less comfy than a minivan for travelling with the swim team (boy scouts, whoever you haul around). None of the kids we take with us have ever complained about the lack of recline.