Since I starting cycling in the early '70's, some equipment has really improved, and some seems to have changed more for marketing effect. The two things I notice that are the most improved are the mid range and low end component really work well now (anybody remember Huret Alivet and Simplex derailleurs Classic non-working components) and tires. Now people talk in terms of thousands of miles between flats. WE used to go hundreds. The most common clincher back then was the Michelin 50 with a live of about 1000 miles, but we all rode tubulars.
No old guy grousing, what do you find is better on bikes these days?