One of the biggest "steps" I experienced was when SSD'd first came around. Suddenly "slow db queries" ran at light speed instead of taking 5+ seconds. It was quite physically noticeable and now it's not. You have to run EXPLAIN on everything to be sure.
Going back a bit further, I fondly remember my dad yelling "did you PARK the hard disk?" whenever he heard me power down the old TRS80 with "state of the art" 5 meg HD physically bigger than my first PC (which had a 40meg HD - dad was jealous). If you didn't manually issue a park command, the read/write head could flop around and cause damage if you bumped or moved the HD.
Going back a bit further, I fondly remember my dad yelling "did you PARK the hard disk?" whenever he heard me power down the old TRS80 with "state of the art" 5 meg HD physically bigger than my first PC (which had a 40meg HD - dad was jealous). If you didn't manually issue a park command, the read/write head could flop around and cause damage if you bumped or moved the HD.