I recently came across a site that lets you log in your Supercharger visits and create a map of where you have charged while on the road. Here is mine (although I have done a couple more since, but no new ones) -
These are 'unique' visits - many of these I have visited multiple times. I've never had to wait, and I've run into broken or unavailable Superchargers only twice. Hopefully this continues to be the case when they start to open up to non-Tesla EV's.
I hope to expand this in 2023!