Don't worry about the brain scrambling. I remember going out on one night shoot and still being a n00b at that time with no more than six months on my 350D.
I didn't have the time or inclination to play with M mode. I know how to use it, and I still have a marked preference for letting the camera do the work. I used Av. First sequence of shots was taken wide open at ISO 100, which yielded nice exposures. I combined this with a trick I'd learned earlier, when shooting at dusk or afterwards, use -2/3 exposure compensation.
Check the LCD, I noticed that the water in my shots was a little bit rough, so I figured I would need a longer exposure. First set of shots was from 1-3 seconds. I started stopping down the aperture until the meter was giving me the longer durations I wanted - anywhere from 5-20 seconds, to achieve the blur effect. Shoot, look, re-shoot. I don't care what people call it, chimping or otherwise (though some say it's only considered chimping when you make the "ooh ooh ahh ahh" sounds.. I never go that far), I'll look at the LCD.
Blurred water, 5 seconds. In retrospect I'd have given it 10 seconds.
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20 seconds. Around the 9 o'clock position in the photo you can see some of the water, and it has blurred even more into a solid sheet with the lights reflecting off it.
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It is a beautiful place.. in fact it is where one of the photos for the EOS 30D white paper was taken.
You might not like all the photos you come back with - out of the 100 frames I shot that night, obviously not every one turned out as nice. But I think you will find the few that make the entire shoot worthwhile. For me, all I need is one absolutely breathtaking image from a shoot and I can forget about every one of the other couple of hundred I botched

(and since I'm a hobbyist I don't have a boss breathing down my neck asking about the botched ones either

I have that at work..)