I might be old fashioned, but I think that if you learn the Vim way you'll have no use for a snippet manager. Also, that using a snippet manager will prevent you from learning the Vim way.
As a heavy vim user for years, I've found myself getting more value out of snippets as of late.
# section #<Esc>yyP:s/./#/g<CR>yyjpo
Instead of the more convenient: box<CTRL-X><CTRL-J>section<CTRL-J>
And to insert the current date and time in ISO 8601 format, type this: <Esc>:Man strftime<CR><CTRL-F><Repeat last key 7 times to scroll through the man page>:q<CR>gi=strftime("%Y-%m-%dT%H:%M:%S%z")<CR>
Instead of this: iso8601<CTRL-X><CTRL-J>
To complete long snippets of text, type this: <Esc>:r path/to/snippet.txt<CR>kJ/<placeholder><CR>cgn<replacement text 1><Esc>cgn<replacement text 2><Esc>cgn
Instead of this: snippet<CTRL-X><CTRL-J><replacement text><CTRL-J><replacement text 1><CTRL-J><replacement text 2><CTRL-J>
The last one might not sound so bad until you realize that you can't have dynamic content in snippets, can't go back to previous placeholders without undoing every change made along the way, can't treat two different placeholders as being equivalent, and most importantly, can't reuse countless useful snippets made by the community.Support for plugins is a first class feature of Vim. While I agree that being aware of the built-in features is a good thing, there's no shame in using plugins that extend Vim in a useful way.
<Esc>:Man strftime<CR><CTRL-F><Repeat last key 7 times to scroll through the man page>:q<CR>gi=strftime("%Y-%m-%dT%H:%M:%S%z")<CR>
was supposed to be this: <Esc>:Man strftime<CR><CTRL-F><Repeat last key 7 times to scroll through the man page>:q<CR>gi<CTRL-R>=strftime("%Y-%m-%dT%H:%M:%S%z")<CR>GP was clearly gatekeeping, but by asking sincerely I hoped to learn something new. And so I have!
All the best.
Also I dislike the fact that you have to actively prevent these expansions instead of actively triggering them.