I should have written that book -- our life is exactly the same
just kidding ... not by a long shot
*Warning to those who hate when I reference our personal experience: the following is once again going to be about my family, in response to Jiro's concern about Li needing more opportunities to be with other ASL-using deaf*
Although my husband and I do need to find ways to 'get more ASL' without losing time w/the child -- I think our level of fluency is pretty poor -- Li herself has a great balance of ASL and spoken language immersion opps. This little one has had a pretty big schedule with a long daily commute since I met her at 1YO, but we think its worth it: a nearly 4 hour van trip a day with 4 other deaf kids to attend a bi-bi school (she leaves at 6:15am, arrives home at 4pm). Friday class is all-ASL, half of her days are voices-off ASL only. Before she turned 3, she was at an asl-based daycare at the same place (far away instead of with me at the child care center available at my workplace) and we also attended twice weekly playgroups: all ASL, with terps for new members, a resident psychologist, SLPs, and deaf teaching staff & director. Beautiful experience, but those 9am-12 sessions are so hard for working parents to attend, and the daycare ended with the school day, we couldn't have done it with traditional 9-5 jobs w/out flexibility -- and still, that took a lot of vacation days between the 2 of us for 2 years! Family ASL lessons on Saturdays, and my husband & I have attended ASL night classes at that same distant school, on alternating nights so one could stay home with the little one.
Most of the parents/families of her deaf school peers are hearing with a few exceptions, although we do mix it up with them on occasion. My daughter's best friend is also deaf, they take weekly soccer, swimming, and gymnastics together outside school/weekends, after which we lunch and/or have dinner. We can't find a deaf peer to join her for piano and kung fu, though. I think you are spot on with the socializing recommendation as a great way to learn and develop, although we haven't done the Boston deaf socials or coffee chats. When I do, I think I'll lurk anonymously until I feel like I can keep up so not to annoy the dickens out of everyone. We live close to Providence and my work commute to Boston is 3 hours a day -- tough to do that twice in a day to attend a social or stay in town and give up seeing the little one until morning, that evening time is so precious. Our families, long-time friends and neighbors use only the most basic signs, so in those interactions, spoken language is primary, although Li has been teaching ASL to her grandmother via skype.
One great approach a friend of ours took was to rent a suite in their house to a deaf couple -- they made life long friends (close for 18 years now) and were able to develop fluency across the whole family in this way. But our house is really too "cozy" (small) and no one would want to live with us out in the boonies