I agree with you about the differences between 1960-1980 and 1980-2000. The main difference I notice between 1980 and the current period are slight changes in how we view sexuality, race, and politics (largely having to do with the fact that the so-called "Greatest Generation" have largely bought the farm, taking their attitudes with them), as well as in music. These changes are largely cosmetic, and most of the technological advances of the past 20 years (the internet, telecommunications, etc) were already in place back in the 1970s.
Thats right, and what is more that these technological changes are superficial. Strip away all your post 1980 electronics and your life wouldn't change that much.
Take away your air conditioning, interstate highways, jet travel, microwave, color television, and all other developments between 1955 and 1980, and you'll be howling.
Culturally, the music from 1980 and 2005 isn't all that much different, movies aren't that much different, family isn't that much different, even politics. On all counts, 1955 and 1980 were much much different.