With the Maxx, the ONLY time I charged my phone during the week was when I drove to and from work.  Slap it in the dock. Drive an hour to work. Slap it in the dock.  Drive an hour home.  On the weekend, I would top it off on the Qi charger on my desk, unless I was out enough for the car dock to take care of it.  In other words, I almost didn't have to even think about it.  For now, I'm going to slap it in the dock anyway, and driving two hours a day with the screen on would kill my phone if it wasn't charging.  
As for the dock mode, I can manipulate my phone much more efficiently with buttons than speech.  I do talk to my phone.  It doesn't always understand me.  Even if it did, I can touch it and get the job done very quickly.  The dock puts the apps I use while driving where I want them, and with larger icons than on the regular home screen.  When I take it out of the dock, the dock home screen goes away, and the same apps are in their respective folders where I want them.  I don't want to make a separate car screen on my regular launcher, and I don't want to dig for them in the folders on my home screen.    
I get it.  Not everyone uses their phone in their car the way I do.  I don't know many people with any kind of dock or cradle in their car.
This is all still just a stop gap until my next car with either Android Auto or something similar is ready to take the phone's place.  Ultimately, I don't want to even interact with my phone directly.  I'd just as soon leave the phone in my pocket and have it automatically link to my in dash device with BT.  I want to interact with the in dash device for navigation, calling, music, scheduling, data, etc.  I'd gladly buy a second Qi charger for my desk at work to keep charging easy.
The point is, I have it working the way I want with the Maxx.  I want the same for the Turbo.  I had a generic cradle a couple of phones back while I was waiting on the official dock to release.  It just wasn't the same.  This will be my fourth phone in this car.  I had a Droid X and then a Droid RAZR, both with the official Motorola docks.  Then I had the Droid Maxx with the official Griffin dock.  Now I have a Droid Turbo.  This should be the last phone I'll have to worry about a dock with. I'm still considering my options.  I didn't want to get an aftermarket radio until my next car.  I guess I'll have to think about it and see what kind of official dock is released (The Griffin dock for the Maxx leaves something to be desired.) and how long I plan to wait for my next car.