I actually came to Mac from a different path than Lisa.

I started with main frames in the late 60's. Wang programmable calculators, remember those? Bought a TRS-80 Model I in the pre-dawn hours of personal computing in 1977 I think. Learned Assembly, Basic, Pascal, TRS-DOS. Fun stuff.
Moved through the Windows world of 3.11 and stayed current in Windows through XP, like everyone else. Had a small business building/selling/reparing machines. Meanwhile, I worked on the side with RedHat, Debian, Xandros, Lycoris, Ubuntu and most every other Linux distro.
When Apple's OS X became mature, long about 10.3, I finally took the plunge. Peaceful. Calm. No "dialog boxes" popping off every ten seconds and extremely intuitive and intelligent design. I found the underlying Unix file structure to be sensible and familiar. The lack of constant virus attacks was a big plus. I also found pretty good software support for cross-platform, mainline software such as Adobe InDesign, PhotoShop, Illustrator, QuickBooks, MS-Office, etc, a great help in integrating and communicating with others in my professional client world.
I confess I find the iLife series of programs (iTunes, iPhoto, iWeb) to be simple and easy to use and believe they are valued added to a Mac machine.