Exact string match in vim? (Like 'regex-off' mode in less.)

In vim, I often want to search on a string with finicky characters which need escaping. Is there a way I can turn off the meaning of all special characters, kind of like regex-off mode in less, or fgrep?

I am dealing with particularly hairy strings; here's an example:

((N/N)/(N/N))/N

Not having to escape any characters to do a search in vim would be a major timesaver.

\V in Vim helps with some metacharacters, but critically not / or \.

command! -nargs=1 S let @/ = escape('<args>', '\')
nmap <Leader>S :execute(":S " . input('Regex-off: /'))<CR>