Vaccination is a tough issue and has been a difficult one for me to figure out. My kids are 13 and 15, so when they were infants, the situation was quite different. I will give you my thoughts on a few individual vaccines.
Polio: IIRC, there has not been a case of wild polio in the western hemisphere since the 1970s (unless there have been some since the late 1990s when I did my research). At the time my kids were born, the only option was the live oral polio vaccine, which caused a handful of polio cases each year, both in infants and in others exposed the shedding of the live vaccine in the infants' poop. To me, this was a no-brainer: if there was a higher chance of my baby contracting polio if he got the vaccine, why the hell would I get it? The injectable (killed) vaccine is much safer, but I don't know the details on it. If you are planning international travel, that is a whole other situation. If you are in frequent contact with immigrant communities or with other people who travel to countries where polio is an issue, that would place Fritz at higher risk also.
Chickenpox: it is unknown how long the chickenpox vaccine lasts. My concern is that we are putting of cases of chickenpox during childhood, when the disease is usually mild.The vaccine wears off, resulting in more adults contracting chickenpox. Chickenpox is much more serious in adults.
Pertussis: the acellular pertussis vaccine was not available when my kids were born, and the whole-cell vaccine was associated with a high rate of serious and sometimes permanent side effects. Unfortunately, pertussis is endemic in many parts of the US, and can be very serious, resulting in weeks or months of illness, hospitalization, and, occasionally, death. The acellular vaccine is much safer, but again, I can't comment on the specifics.
MMR: measles and mumps used to be common childhood infections that everyone got. Yes, there can be complications, but they are not common. The big risk held up for mumps is male infertility, but the reality is that mumps affects the testes very rarely, and almost always affects only one, so infertility is vanishingly rare. Rubella is extremely rare now, but the consequences if it is contracted during pregnancy are devastating.
Hepatitis B is a blood-borne pathogen; you contract it the same way you contract HIV. Unless you think your infant will be having unprotected sex or sharing needles, it is unnecessary to consider this vaccine for at least a decade. They only give it at birth because it's hard to get teenagers in to the office to get vaccines.
I used data from the Institute of Medicine (part of NIH) when I made my decisions. They rated the risks of each vaccine; most of them were unknown, because the vaccines generally do not go through the same rigorous trials that most medications go through. After weighing the risk-benefit ratio of each vaccine, I chose to delay almost everything. The decision was difficult and I never felt easy with it. My decisions might be very different today, however. My kids have now received most of their vaccines - after their nervous systems were matured.
In terms of herd immunity, my feeling is this: when I chose to become a parent, my primary responsibility was to my child. To put one's own child at risk is to be an irresponsible parent. People who choose not to breastfeed are putting their babies at much higher risk than those who choose not to vaccinate, but they are not being excoriated for it (no offense meant to those who were unable to breastfeed).