1. Extreme loss of maneuverability.
There are times (and they are many) that I know I could handle the current traffic situation much better if I was on two wheels. The ability to process incoming visual information and transfer it to moving the bike seems to work at a much faster rate while on two wheels. I'm sure that comes from the fact that one is "more aware" when riding a motorcycle.
2. Feeling of being caged in.
The "cager" name obviously comes from somewhere and you feel it when driving a car. There is too much temptation when driving to be lulled into a "I'm the only one here" frame of mind and there are too many things to distract you from what you really need to be doing. I miss the lack of feedback from the world while being sealed up in a car.
3. Rage demon rears it's head too much.
Have you ever seen the Disney cartoon with Goofy called "Motor Mania"? It came out in 1950 and is classic Goofy. It's also exactly how I see practically anyone who gets behind the wheel of a car. It's like a Jekyll and Hyde transformation and all it takes is one little thing to set someone off. It happens with me as well and I don't like it. I have taken chances that have brought me way too close to an expensive meeting of metal. On bike, I'm calm and much more centered. I may glare at people who act like I'm not there, but my chances of freaking out are slim to none.
4. Lack of visibility
In my mind, motorcycles give you 360 degree vision. At a point in time I can see anything around me with a quick glance. Nothing of my vehicle gets in my way. In a car, the car actually gets in the way of being able to see. There are just way too many blind spots when compared to a bike and when you have passengers...well, stationary blind spots are bad enough...ones that move around and babble are worse.
Actually, hate is a little strong. I really do enjoy driving the car, but as we all know it doesn't even compare to riding bike