I managed an MS server VM. I was the only person managing it. I finally had to dump it one someone. I was still making changes when they yanked my access. It was constantly running out of memory. Adding RAM would not have fixed the problem. I went back 9 months later and no one had touched it. I stayed on for 8 months when I noticed I hadn’t spent the money I made.
I gave them 2 months notice and bailed. I miss writing code but when you retire, you have to make retirement your new career.
I have clients with both VMWare and MS Hyper-V. I use Oracle VBox for setting up appliances, linux test machines, etc...
The company I work for is a National IT chain that was purchased a few years back by a multi-National company. So the work I do now is for client coast-to-coast. Keeps things from getting stale.