]Some two minute thing on Mac can often take me half an hour on windows.
such as?
Graphing data (read: up to millions of data points). In Windows, this will involve launching Excel for small datasets (/dies, because y'know, excel is so efficient and all) or a proper software such as Mathematica. These programs are heavy on the processor, and unless it's a bloody good computer (and I consider my machine as decent) or you are a very patient person, you might as well jump off a cliff. On the Mac, a simple lightweight software called 'proFit' can handle it all with ease, generate nice graphs, and doesn't lag up the computer.
I also accidentally (and quite frequently) open text files that are as large as ~50mb. Tried that on a Windows machine? It dies. The Mac doesn't complain that much at all.
So when I do my work on the windows, it'll usually involve me having to kill a process and start again because I accidentally tried to do something stupid and cause a program to hang. You can argue that's my mistakes, but should I change my habits for my computer, or should I find a computer that works for me?
[This is a comparison between one of the old Mac Mini (snow leopard) vs an C2D-2Ghz/2Gb-RAM/W7 laptop and AMD-X6/4gb-RAM/W7 desktop, it's definitely not the hardware, it's the operating system.]
PS - Also, Macs are much easier to network. SSH and things of that like are built in, where on Windows I have to use an SFTP client to connect to a commercial mainframe and most of the time have to control everything through another SSH client (read: millions of windows), on the Mac I can easily map SFTP drives into 'Finder' (counterpart to Explorer), and the built in command prompt in OSX works as the SSH client, which happen to have transparency settings and can be customized, which makes window management SO much easier. And don't get me started on printer sharing over network...
PPS - it's not that PC have less power than Mac, but can you understand my point that, as a Windows user, the things I used to waste time on all of a sudden have disappeared when I switched to Macintosh.