People adapting to each other is what makes things fun though
A quick and simple micro on your part creates more micro AND guessing on your opponent. Still a net win for you.
(Sorry for the ninja edit. I just had an afterthought)
Yes, I can appreciate how things can get hectic. To save a little more time, you can do the shift click move on the mini map rather than scrolling in the main view. Click all the way back near your base on the mini map if you like. With cool down times over a minute, you'll have lots of time to move it to a better position closer to the front before it's able to fire again.
You might still lose it to a fast rocket counter fire, but having it start its move order instantly after it fires is way better than trying to move it after the enemy's rockets are already raining down, and you'll never lose it to off map or mortar fire.
We're you using -shift- to queue commands when using it? Barrage, then shift-click a move command back to safety is a really good habit to have to reduce counter fire damage, and to hide its location. Good rules for all rocket arty actually.