They were easily my favorite "toy" to play with as a child, and I still play with them occasionally with my daughter. I have all the LEGO blocks I got when I was younger, and have collected a few more sets and bulk bags from various thrift stores.
It's amazing to see how many unique pieces have been designed in the last 20+ years, and comparing them to what we had to work with in the '80s. A specialized forklift piece(s) back then was a part to be protected as it was easily stepped on and broken. Plus, there are so many different colors now, which didn't exist back in the '70s and '80s. It was black, blue, red, white, yellow and grey back then, with a very rare clear blue or clear yellow windshield part from an "outer space" type kit.
I used to use the blocks for mold boxes, too, now use other things.