I'm sure some people did, a few even mentioned it here. I'd say the vast majority have not though.
Price of phone + laptop dock together = $499 + monthly tethering. If it's not the $499 price tag turning people away, it's the mandatory tethering.
If you get the phone alone, it's $199 (with some discounts available for certain accounts) and then $499 for the laptop dock alone if purchased later. The advantage is not having to buy tethering I guess - that, or not paying an early adopter tax.
My prediction is that the laptop dock won't sell very well and will drop in price significantly - and/or 3rd party docking options may be available.
Apparently you can always just hook your phone up to any TV or Monitor via HDMI/DVI and get all the same functionality.