1. The neighborhood is pretty homogenous in terms of professional backgrounds. There is a sizeable chunk of original owners/ IBM retirees. If you work for the major tech companies (Cisco, Intel etc.), you will find a lot of colleagues.
2. A lot of people are moving in for the schools - the school is the primary hub of social interactions. One interacts a lot with the parents there.
3. If neighborhood interaction is really critical, make sure you are in a Cabana club neighborhood. You get to meet a lot of people in a relaxed setting and you can make heaps of friends there. There are 2 major ones - Almaden (on Bret Harte) and Shadowbrook (on Shadowbrook)
4. The kind of street you live is key ingredient - which is the same in any neighborhood. Those who live in courts are naturally closer to their neighbors than someone in a busy street like Camden.
Though i wish there were some block parties here, it is a very friendly place.
Look at the homes and ask your self would you spend time in the front yards? are there children with time to build connections to neighbor's children? are some of the homeowners stay at home people? are there local meeting places?
Almaden Valley real estate statistics at http://julianalee.com/san-jose/almaden-valley-statistics.htm
San Jose real estate information at http://julianalee.com/san-jose.htm
As Terri implies, different people can have a different experience in the same place.
Top 2 agent nationwide at Keller Williams Realty, the nations largest
Over 20 years experience
Over 1,000 homes sold in Santa Clara and San Mateo Counties