I managed to get used to that way back when the first Gran Turismo came out. Was really good to be able to control throttle analoguely, and definitely makes the game easier when you get used to it.
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I tended to still use buttons for Gran Turisno because it supports the pressure sensitive nature of the PS2 controller's buttons so I could feather the throttle that way and it worked really well.
Yep, that is true. I still just used the buttons on the first two games thought because at the time (for some reason) I couldn't get to grips with the two stick methods, and then when GT3 came out on the PS2 I liked the analogue buttons, but now I play it with the two sticks.