Security through obscurity is definitely not the solution, but I'll tell you that I've been running SSH on a non-WKS port since the mid '90s as a standard practice, and the number of attackers attempting to connect there seems to have been 0, even during the "lets try all sorts of common logins" crazy days.

Let's face it, the sort of person who moves SSH to a different port probably is also the sort to disable password logins. So the effectiveness of searching for their SSH daemon is probably pretty low.