For me, it was...
Fortran and Punch Cards in college... Hated that...
Imsia 8080's, latching in bytes one bit at a time... Cool, but still tedious...
Various 8080 and 8088 PC's, most notably Zenith... Z80 upgrades!
Acoustic modems, Irma Boards for IBM 3270 emulation and communication, tape backups that never seemed to work reliably, 5.25" backups that to forever to complete and used stacks of floppies... Who remembers the large format floppy?
Commodore Pet, Commodore Vic20, Commodore 64, Apple IIe, Commodore Amiga, Commodore CDTV...
The Commodores were all about the Motorola processors...
Fortran, some Cobol, some RPG-II, Some Pascal... A ton of dialects of Basic, too many to remember...
I have forgotten so much since then, seems like a century ago but I know it was only decades...
I do remember writing a working machine language program for the C-64 that used that use hardware interrupt routines in a partition of protected memory that I created which managed two protected memory partitions of 11k each....
In those two partitions, each could have a running program with the interrupt routines managing requests for resources from each program in real time...
Yup, multi-tasking on a C-64, awesome, but pretty useless in 11k chunks... Yet, still awesome!
Of course, follow that all with multiple versions of DOS (and back in those days, some versions were hardware specific and only ran on a certain brand of PC!) Get you some of that!
USENET, Major DOMO...
The Internet... EMail, what a concept!
Multiple versions of Windows (who remembers Windows for Workgroups?), NT, Vista, Pro right up through Windows 10.
Text Messaging! Yikes!
iOS on the iPad, Various versions of Android and now Windows Phone.
P.S. You haven't wasted time until you have dialed into a Punter BBS at 300 baud! ( and I know I was on the Color Punter board a few times as well!)
And through it all, I have somehow been able to live without a BookFace account! Yeah!