When I'm talking to my friends it's not always easy to explain why I would put together a computer out of 40-50 year old parts, but besides having fun with it, it really does have a lot of practical value.
Since it's sitting there on my desk anywayy - with control signals neatly broken out, 5V and 3v3 available, along with the complete 16 bit address bus, data bus and plenty of IO - it really does beat a Raspberry Pi or an Arduino for easy of use. 

Flip the power switch, turn on the screen and use the keyboard to scroll through memory or scan for I2C devices - it really doesn't get much easier than that. 

If it's hard to picture, I made a quick video yesterday that shows how I do just that. 

P.S. Contest video about my 6502 SBC coming soon!