Yes. I used to hate the idea. I was a butter or olive oil guy. But after trying mayo for the toasting it was impossible to deny that it offered the cheapest, best coverage, and most superb results. I still do olive oil for some specialty situations but mayo is now the default. So much so that it changed the way I stock my fridge.

I rarely ever used mayo. I'd make it as I needed it. But after using it for grilled cheese I started buying the commercial stuff. When making mayo you have to plan a few hours in advance. But grilled cheese is a spur of the moment kind of thing you don't start hours in advance. So now I buy mayo. In fact I bought some today because my old jar is almost dead.