I am also an amateur competitive road cyclist... I was injured in a crash last August and broke my hip. I moved from Manhattan to Jersey City, New Jersey that December. After 6 months recouping, I tried to get out and ride my bike, but I have to travel at least 10 miles on narrow, high-volume traffic thoroughfares before I can reach any roads that are actually safe to ride on. Needless to say, I haven't competed in any races this year, and I've put on almost 40 pounds in the past 6 months. I could eat all day long and not budge from 155 pounds... I've continued to eat the same amount, but yesterday I weighed in at 192 pounds :-(( I bought a trainer, but I cycle for enjoyment, freedom and exhilaration, not as a compulsory workout. Good health is merely a side-effect of my chosen hobby.
Jersey drivers are notoriously bad; the roads south of the George Washington Bridge are in horrible disrepair, and drivers have the mentality that the road is completely theirs and nobody else has the right to be on them - cyclists least of all. I LOVED riding 10-20 miles per day to work and back each day while living in Manhattan. Nowadays, what should be a 6-mile commute is a 25-mile commute, because I have to either take the PATH train, or ride 20 miles out of my way to the GWB on dangerous high-speed roads that do not accommodate cyclists.
Contrary to logic and popular belief, I find New York City to be extremely cyclist-friendly. I take up a lane, ride the speed limit, stay out of people's way, and obey most traffic laws. IMO, bicycle lanes are THE most dangerous place to be - nobody respects them, doors fly open, people double-park in them (cops and delivery trucks especially)... New York City drivers - and buses and taxis - are aware of how many cyclists are on the road, and are generally on the look-out for us (and this goes hand-in-hand with the cyclist obeying the laws and using 'common' sense). It is the *out-of-towners* who are the most dangerous on the roads, because they are either oblivious to cyclists, or have that "you don't belong in the road" mentality.
I am moving straight back to Manhattan early in 2013, and can't wait to get back on the road - and lose all this fucking fat!!