Talk about irritating. A laptop is not a phone/tablet. A laptop, even a tiny netbook, is big enough to allow the LUXURY of haptic feedback, so why not provide it?!
Apple's trackpads provide haptic feedback. If you push them gently, there is a soft click, if you push them more, there is a hard click.
An additional benefit over hard buttons is that applications can use it for additional feedback. E.g. OmniGraffle provides subtle haptic feedback via the trackpad when objects align, which I find extremely handy for quickly aligning objects.
I like distinct buttons. I like being able to tell by feel where my fingers are. I lose track of my finger's position on a big trackpad where the only clues to finger position are the edges of the pad. This leads to touch leakage: you go click but you touch halfway in the button area and half-way in the trackpad area and so the mouse pointer jumps as you click, thus clicking on the wrong thing. Talk about irritating!
An additional benefit over hard buttons is that applications can use it for additional feedback. E.g. OmniGraffle provides subtle haptic feedback via the trackpad when objects align, which I find extremely handy for quickly aligning objects.