Just came back from Vientiane. The roadworks at Gorat are done now so it's a bit easier to get past. The road works in KK are still there and the traffic is the same as always.
The traffic in and around Udorn Thani has changed a bit though. On average they are driving slower. Especially in the city it's a nightmare because they actually drive 20Kph an hour now

It took me 30 minutes to get through. (At night it's 10 minutes tops)
At Nong Khai of course you need to park the car at 100THB a day, can be done near the border. (I won't drive in Laos, Gas prices are through the roof there)
Had a good time in Vientiane mainly because of the food (The French restaurant at Lao Plaza reminds me of my mother's cooking).