The biggest difference I noticed was walking down the streets and not once being accosted by people asking me for money. I wondered what happened to all the homeless in Berkeley and found them during an early morning jog, large numbers of them sleeping outside of the student union. Walking by there a few hours later the homeless had disappeared replaced by a long line of students waiting for I don't know, perhaps concert tickets of some sort.
Circumstances caused me to cut my trip short before I had a chance to visit the CS department or really explore the city and university. But I'll be back and it hopefully won't take me another 23 years to return.