Take Apple's keyboard on their laptops for example.  Without dedicated 'Home', 'End', 'Page Up', and 'Page Down' keys, users must now resort to a less intuitive process of using 'Fn+Up Arrow' for 'Page Up'.  'Home' and 'End' are an 'Apple key + Left/Right Arrows'.

There is still enough space on the laptop available for Apple to add those keys.  Why they don't is I'm guessing presumably a "Steve Jobs thing".

Users coming from most PC environments will eventually adapt.  But this one example, I believe is where "thinking different", doesn't seem to make much sense to me.

Being a developer, one of the absolute most important tools you need is a good keyboard that permits you to move the cursor around as quickly as possible.

Thankfully Apple still makes a full keyboard with numeric keypad.

Happy typing!