New Start menu:
1. Click Windows key
2. type (typically) three letters of the program you want to run
3. Click <Enter>
That's 4 keystrokes, bound only by the time it takes the user to physically make the keypresses.
User doesn't need any knowledge of how programs are categorized, nor know a hierarchy of categories.
The process by which the system displays programs matching what the user is typing happens as fast as possible.
You can even speak to your damned computer and the start menu will probably react accordingly.
None of these actions require the user to even know they have a harddrive, or a system path, etc.
So modern users have a discoverable, accessible, realtime-responsive start menu that requires minimal cognitive load.
Remind me: how does Windows 98 Start Menu compare to that?