Actually, I couldn't agree with you less regarding the "hockey puck mouse."
Yes, I scorned it and swore how difficult it was to use years ago. Since then, I've had a lot of trouble using (conventional) one- and two-button mice due to RSI-related pains. After working for hours on long-term projects, it got to the point where my fingers would continue clicking, on their own, even after I had gotten up and walked away from the computer. Yeah, I know that the ergonomics crowd will say that I need to take frequent breaks and all that, but tell that one to my manager when we're on deadline.
As a last resort I dragged out the old hockey-puck mouse and discovered that these pains have largely subsided. I have since acquired more and populated all of my Macs with them.
I've wondered why these seem easier to use, and I have to conclude that it's the shape (it's round, like a ball -- very natural for anyone who enjoys sports involving balls), plus I can use any of three or four fingers to click (thereby reducing the stress any one finger has to take).
You might think I'm a little crazy, dumping my white Apple optical mouse for the old hockey puck, but I use what works for me. When I first grab it, my middle finger lightly grazes the top of the cord, avoiding any "orientation" issues. I have to clean it regularly, but this seems a small price to pay for having pain-free hands that don't click mouse buttons on their own.
For the record, these were also manufactured by Logitech.
Mighty Mouse: Excrement Now Comes in White