wow you guys really are old. I learned system 370 assembler in 1979, the 360 architecture was superseded by the 370 well before that.
I started in high school on a DEC PDP8/e using BASIC and Focal (I still have a Focal programming guide for the PDP8 family). That was 1972. In college I programmed mainly in FORTRAN, then Pascal, in industry I used PL/I, CList and by the late 1980's REXX. COBOL too but I hated that and avoided it whenever I could. I did some programming in C on the mainframe but most of that was on Unix boxes where I also did some Java and one of those scripting languages, I think it was perl. I hated Unix and went back to the mainframe, although OS/390 and z/OS are actually certified Unix operating systems as well. Hybrid MVS/USS sysplexes.
I never actually programmed in assembler as by the 1980's mainframes were fast enough that none of the companies I worked for would allow new code in assembler and I didn't become a systems programmer until the 1990's. By then I think only exits were still being done in assembler.
I retired last September and really don't want to think about this stuff anymore
Eric