Absolutely!
BART, our subway system, is perfect for going into San Francisco or even out to the two airports. Sweetie and I used it frequently for going into Berkeley to see a movie or to the theater or for dining out. From our station to downtown Berkeley cost us 65¢ using our senior passes. A trip to San Francisco, depending on exactly where the destination was, was about $2.25 vs, at the time, more than $5.00 ($7.00 now) for the bridge toll plus gas plus the hassle and expense of parking.
Sure, public transportation is not ideal for all situations or at all times, but here it can certainly be an efficient and inexpensive adjunct to using one's car. And at certain BART stations, at certain times, parking was free, and it's always free with a disabled placard.
When I visit my sister in New York, we usually take the LIRR into the city. The trains are comfortable, with big, cushy seats, and offer "quiet cars" where radios, cellphones, and loud talking are frowned upon - somewhat akin to a library. Very pleasant and enjoyable.