I have gotten used to driving with 2 hands as well, my 3 series automatic has very tight steering wheel so on turns it would be easier w/ 2 hands. Now my 911 on the other hand is a 6 speed, and rarely i will leave my hand lightly resting on the shift knob between shifts, except when driving harder, then i have to use 2 hands between shifts to else it feels like the car will get away from me, but when cruising I will still use 2 hands cuz that sucker has the tendancy to the front end to jump around.

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2000 BMW e46
2004 Porsche 911