Regarding the double click that is pretty easy - just put two fingers on the trackpad and click the button.
The best two finger function is the two finger scroll - I find myself doing this on Windows machines and wondering why nothing happens!
The network thing was an issue when I got my MacBook (Intel model with faster network card) but software updates to the Mac and router have sorted that out now (although to be fair it really shouldn't have been an issue to start off with).
Quicktime is also true - it should come bundled with a full screen mode.
And the Finder / Spotlight thing is an ethos thing - I don't think that I have ever used Finder to find a program in my 2 years of Mac ownership!
I used to be major PC lover who tweaked everything on my PC and tok great pleasure in getting it to work properly; but then my wife forced me to get a Mac to replace my PC when it finally died ('cos it was pretty) and I really haven't looked back. Took about 3 weeks to get the hang of it but it was really well worth it! Doubt that I will ever go back to a PC.