I took a short look at the Secret of Monkey Island and wowow it looks like so much fun! I just posted my first video (same post with my Gabriel Knight video list) and geez how could I have never played my dream life as a pirate? So I'll be doing that.
I don't know if I'll stop recording Gabriel Knight but Monkey Island certainly has my interest for the moment 
Yay!
Monkey Island is so much fun.... to watch. LOL. I really suck at adventure games, but I've watched Longplays of every Monkey Island game. I can't believe you're just getting into the series, but I'm glad for you.
Interesting voice facts:
Alan Young - "Scrooge McDuck" from DuckTales; "Wilbur Post" from Mr. Ed; Irishman from Monkey Island series (Sorry, I forget the name.).
Jim Cummings - "Winnie the Pooh"/"Tigger"; "Monterey Jack"/"Fat Cat" from Chip'n'Dale Rescue Rangers; Several characters, including police officer who gave you the package, from Gabriel Knight.
It sounds like Rob Paulsen ("Yakko"/"Dr. ScratchinSniff"/"Pinky" from Animaniacs, "Raphael" from the GOOD Teenage Mutant Ninja Turtles cartoon (1980s)) is the voice of the ghost pirate who spoke with LeChuck in the cut scene.