I went on a Wednesday to make the experience as quiet and fast as possible.
Parked my car at the friendship bridge covered car park at 7:45 (฿250 per night, meh)
Stamped out of Thailand, waited a few minutes and got on the bus to cross the bridge (free, as no one was selling/checking tickets)
Filled out Laos VOA forms, got the visa sticker, received a note with a QR code to facilitate payment
Paid US$40 with the QR code at the LDBank counter next to the exit gate (pristine USD notes required) and received an exit QR code for the gate
Aggressive tuktuk driver offered to take me to the consulate for ฿300, ฿200, and then ฿150, I declined and got on the bus (still free!)
Waited in the bus a few minutes before taking the short ride to the Savannakhet bus station
Got a tuktuk ride to the consulate for ฿50 after some haggling and discussion of current fuel prices (started at ฿100)
Arrived at consulate at 8:57, 5 other people in line, gate opened 3 minutes later
Waited in line less than 5 minutes, submitted only the documents listed on the Savannakhet consulate website, paid 5K, got a next-day pickup ticket and left
Tuktuk to hotel ฿50, no haggling required since the driver saw me pay ฿50 to the tuktuk that brought me in 555
Aura Residence ฿400/night, let me check-in super early, building's getting a bit old, but clean, big rooms, comfy beds, fast wifi
Next day tuktuk to consulate ฿50
Picked up my passport with a shiny new visa, quite a few people (20 maybe?) but literally no wait time, passports were flying out the window
Tuktuk to bridge ฿50
Bus over the bridge ฿50 (had to pay this time 555)
Total: ฿250 parking + ฿250 transportation costs + ฿400 accommodation = ฿900 + misc
Visa fees: $40 (฿1450) + ฿5000 = ฿6450
PS:
Turns out Laos immigration was charging people a "Development and stability of Laos" fee (including receipts and all). It was ฿100 on arrival and another ฿100 on departure for farangs. Some thais paid ฿100, some paid ฿40, some paid different prices on arrival and departure. I somehow managed to avoid this fee completely, as on arrival the VOA officer decided to stamp me in himself, so I didn't go through the normal arrival windows, and on departure, once I found out that the window I was in line for was charging a mystery fee, I immediately switched to the Laos citizens window. They were a bit grumpy about it but stamped me out anyway and no fee.