Every distribution of Linux I've tried in the last five years or so "just works". You don't have to use the CLI at all.
Every one of the major distros (and most of the others, as well), can be run from a live DVD so you can try it out before installation. Or do what I did, download several and install them onto a USB drive (I used LinuxLive USB Creator). You can test them all with only a reboot between each one; you won't even have to swap DVDs.
And, for what it's worth, sometimes you have to use the command line in Windows, too.
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