3.5" disks/drives could also be 720KB, I have an 8086 from Olivetti with a 360KB and a 720 KB drive. I know 2880 kbyte disks and drives existed too (they used to be mentioned in every BIOS) , but I never saw a computer with one.
There was a 3,5" floppy compatible "SuperDisk" standard which could store up to 120Mb per disk. But the Zip disk already had a big market share then.
I remember using QIC-80 tapes for "software sharing" - since those drives were reasonably cheap and could be wired to an existing floppy disk controller.
120 Mb at floppy drive speeds? That must have been painfully slow...
As a kid, I had a bunch of DOS games on CD from around that era.
You were screwed if you had an error on disk 43.
For games I remember Star Trek 25th anniversary on 7 floppies, using 1/4 of my hard drive.
I believe those games were mostly graphic adventures (especially Sierra's), or productivity software that came with lots of clip-art, fonts etc.
I'd have to dig around Mobygames to come up with specific examples for each case, but 7th Guest (1993) came on multiple CD's and King's Quest V (1990) came on a stack of floppies.