I like buttons on Android phones: Back and Home buttons are absolutely essential, while Menu and Search are also useful. When I said buttons, I indeed meant real physical buttons that can be pressed without looking at the phone. However, over the last few years, Android manufactures shifted from physical buttons to “soft” buttons and it’s a pity.
One feature that makes soft button experience slightly better is a haptic feedback: a brief vibration when a soft button is pressed. In addition to soft buttons, vibration also occurs when phone dialer buttons are pressed. Depending on the model of your Android phone, this feature may or may not be enabled by default.
On Gingerbread and Honeycomb devices (Android 2.3+) haptic feedback can be enabled or disabled in the Settings -> Sound -> Haptic feedback.