Yes, they do. It's still the best way to get news of traffic, speed traps, etc.
What else are they gonna do? Program their cell phones with the thousands of other truck drivers on the road? Lol > Even if they could do that, they'd have to know who was driving which rig. Rather than just giving a general call out.
Plus - there are no laws against using CBs while driving. Because they are technically "emergency equipment", like HAM radios.
(Logging roads still have signs posting what CB channel to use, also.)