why not let people syntax highlight the way they want? some people dislike syntax highlighting, some like high contrast highlighting, some like blue-tinted highlighting, etc. why do you get to decide for everyone what colour strings should be?
send the plaintext code snippet and they'll decide.
For the life of me I can’t remember the syntax for a particular thing I do in the JavaScript console at work. Someone showed me the trick in an email about seven years ago and about once a month I need to do this thing so I search my inbox for the email so I can remember the syntax.
It might be "easier and faster" to send an email than to, for instance, upload to a dedicated snippet manager, but literally everything after than that is slower and more difficult.
And no, creating snippets on a wiki is also an extra unnecessary step. Email is just easier and faster.