I'm glad I'm not the only one who feels this way. People talk about differences in tubes and I can't hear them, either.I honestly dont see the advantages of tube rolling in amps when most people are using the amp on a Medium to LOUD electric gig...
I have great ears.. and the difference is so negligible if any at all, that it is hardly worth the effort or the money .. The only one making out are the tube vendors. IMO.
(long story warning) My first experience with tube rolling was in 82. I wanted to retube my V4B because all the experts in Guitar Player said you should retube at least once a year. My dad told me I was nuts. He worked for the Navy repairing flight sims and other stuff and had tons of tube experience but not with musical gear, and he said just change them when they go bad and don't listen to the nonsense. I told him that the experts said it makes all the world's difference in your tone to retube every year, and I went to the store (electronics stores actually carried tubes back then) and got all new tubes. Put them in, tried it, then took them out, put the old ones back in, and returned the new ones except I kept a couple spares.
And to this day I can't tell the difference between an old Amperex 12DW7 and a JJ 12DW7. I can tell when I look at them that the Amperex is built way better, and I can tell when a tube is on its way out, but that's about it. Enough folks who have the knowledge and experience tell me they do hear differences so maybe I don't know what to listen for, but I'm not going to sweat it. As long as it's running to spec, that's all I care about.