Here's what I'm referring to, Mark (and I'm sure you'll agree).
The 60K service is basically the same thing as the 30K service, with a few additions (e.g. replacement of fuel filters and spark plugs). The items in the 30K/60K/90K/etc service include the transmission fluid, brake fluid, air filter, valve adjustment, etc. These services are specified for every 30K miles or 2 years, whichever comes first. Some of them, particularly the fluids (brake fluid absorbs moisture over time and becomes less effective), are really important to perform every two years, even if the car doesn't accumulate 30K miles during that interval.
Sure, you can wait 5 or more years to replace the spark plugs if you want. But I would still make sure that most of the 30K service items are performed at least once every two years (which means not waiting 3 or more years past when you did them for the 30K service).
As for the question of which services make it worth driving further for greater expertise, that's a function of what you need done, and how much greater experience you get by driving further. My own situation is a good example. There is an independent mechanic one half mile from home, who specializes in servicing Honda/Acura automobiles but not the NSX. I use him for changing brakes, tires, oil, and brake fluid. For more complicated (but routine) service on the NSX, I drive fifty minutes to the dealership (Woodfield Acura) which does the most NSX service work in the Chicago area. When I need something track-related done (cooling ducts, etc), or if I were going to have a supercharger installed, I would drive 100 miles to Acura of Brookfield, which has expertise in these areas beyond what I would find in the two Chicago-area dealers (out of nine) that do a lot of NSX service work.