Up until a long road trip to Atlanta from DC for Thanksgiving I've only had to use a Supercharger a handful of times and usually was the only one at them (even around Richmond, VA where I've gone twice to an 18 stall supercharger on a couple of mid-range trips) so was interested to see my experience on the trip to Atlanta. I stayed off of 95 and took Rt. 29 to 85 to get from Northern VA to Atlanta.
The first stop was in Charlottesville at their 8 stall supercharger. Just one other car there on the way down at around 9 AM on Tuesday and three at 5 PM on Saturday after Thanksgiving.
The second stop was in Greesnboro, NC at another 8 stall supercharger. On Tuesday around noon there were four cars there, but two stalls did not work so there were two open chargers. On the way home there were 9 cars there when I arrived (again around noon on Saturday), but with the two broken chargers had to get in line and wait about 15 minutes.
The final stop was in Greenville, NC right off of Rt. 85 around 4 PM (which I thought would be the busiest location being right next to the busy highway) and for the 8 stalls only about 4 four taken on the way down and just a couple of the way back.
So all in all not much issue with them being too crowded (and all were smaller 8 stall ones) with the exception of the Greensboro one on the Saturday return, but that was because of two broken stalls.
My question for the board is what has your experience been on trips along major routes with superchargers? Have you had to wait long or are stalls usually open? My concern is that as each quarter goes by and more Teslas are sold (esp as Model Y comes out) that the superchargers are going to start to become completely full along these routes and wait times will increase. it doesn't look like there are too many planned in the near future in this part of the country so hoping Musk has plans to potentially expand existing ones.