If you had the Calculator pinned to the Start Menu, it would take fewer clicks (two). If you pinned it to the task bar, that would take still fewer clicks (one). Or you could press the Windows key and start typing Calculator.
I have over a hundred programs installed on my desktop machine and I use every one of them although most are rather infrequently. Since there is no way I'm going to remember the names of all of them, having a menu is essential for me. Scanning an alphabetical vertical list is one heck of a lot easier and faster than scrolling horizontally through over a hundred tiles.
I saw one or two other people with same argument, so this to you and them. Having a program pinned to the startmenu or taskbar requires having already pinned it there. That assumes that it is a program used often enough to make you want to pin it. Even on high resolution screens, both have limited real estate, and I think in your case especially, it would be non-sense to pin every single installed program and those built in to the task bar. If anything, I'd think that would be a waste of time. Its a moot point anyways since you can do it 8 too. And typing isn't always a good option either. As you stated, if you have a lot of software installed, you can't always remember the name of everything. I would also say typing out the name of a program requires much more effort than clicking something. Furthermore, your statement about having to scroll through tiles just proves how ignorant you are about how the start screen actual works. At least try it instead of making up "facts". If you scroll down, or click the bottom of the screen on a desktop, you get a screen with all your programs listed. No tiles, just a list. You have a multitude of options on how the list is arranged. The basic choices are by name, by date installed, by category, and by most used. With the start menu, you don't really have any easy choices. You can customize what folders programs are in, but that's time consuming. If you don't like live tiles, there is an option to go to this list when hitting the start button/windows key by default, skipping the screen with tiles entirely.
EDIT: Also, I would say having a list that takes up the entire screen, in vertical columns, makes it a lot easier to find a program than scrolling through a one column list.