Those Sierra patches are great. I recently played the whole trilogy from my old CDs, even added subtitles to Beast Within. Great stuff and definitely every fan of the adventure genre should play these, but they are not
that easy.
Old games in general tend to be on the harder side. Full Throttle might indeed be the friendliest of those. The Longest Journey should be a good introduction to the genre too though not terribly easy. My first playthrough was Loom, so if graphics are not an issue, there's a good old one
.
From new games Memento Mori is rather good and easy, Gray Matter also.
Monkey Island 3 and Black Mirror 2+3 would be great games for starters but I'd still recommend people to play them in order and the earlier games are a bit harder.
I have my own eyes on Gemini Rue now, will start it soon, the Blackwell games were good and easy also, again excellent if old/low graphics are okay.