Generally, yeah. I'd always look for larger margins - i.e. 75+% of going in one direction while the line either remained the same or went in the opposite direction. Was an indicator that the books were looking to make a killing vs joe public.
66% isn't a huge amount but it is telling to me that the line hasn't shifted the slightest.
In the interest of full disclosure, I had the most success following this trend in college basketball. Then CFB. Worst luck was NFL. Betting NFL in general was never successful for me, but I was too stupid to not do it.