I saw lots of ticks while hiking in California, but I think the nervousness associated with ticks and lyme is dependent on where you hike most.
http://www.cdc.gov/lyme/stats/maps/map2013.html
The rapid spread of lyme into central new york has forced me to take a different approach to the weekend and weeknight hiking I usually do on the Finger Lakes Trail.
On the east coast, whether its blackflies, dearflies, mosquitos or whatever, you always have bugs crawling on you (something you get used to). There's always a bug in your hair. You're almost never entirely certain there isn't a tick or tick nymph on you somewhere.
I've already pulled two off my five year old daughter this year and we still encounter patches of snow here and there, so it's not like they've been out for that long. I hate having to tell her to stay on the trail… It's certainly not what I did when I was her age. We have to do a nightly tick check even if we were just in the backyard or park.
Again, I'm not changing the amount of hiking I do locally, but I do notice that I'm planning my longer hikes in areas where lyme isn't as prevalent.