The comma between merry and gentlemen in "God rest you merry, gentlemen" is important, but nowadays the hymn is sung as if they were just merry gentlemen. As for the Good King Wenceslas, the tune is a venerable spring carol (Tempus Adest Floridum) and even the translation from the original Latin is far better poetry than the odd stuff about the snow lying even. You can see if you agree by googling "Spring has now unwrapped her flowers."