I think so.
I always left a handwritten card and still would. Being handwritten, it shows that you took the time out of your schedule to appreciate them taking time out of their schedule to do yourself a favor. In the past (and in general), people who've handwritten me thank-you notes always stood out. IMO, it's one of those dying trends, especially with all the technology out there. You never know when you'll need their help again (job searching, connections, etc.)