Has bicycle gearing become 'easier' over the last few decades?
I think gearing has become more "complex" over the last few decades, but I wouldn't say its become "easier." Material weight of the frame and parts have gone down on affordable bikes, which translates directly into a lighter bike under the average rider. Also, There are a number of people who believe that a higher cadence isn't a bad thing:

http://coachlevi.com/cycling/high-vs-low-cadence-pedaling-speed/

Also, most mid-level road bikes have a large cog of 52/53 and the rear cassette will go down to 12. so thats pretty close to your granddad's ratio!