If you do them once an hour,
and remember to stand up hourly also, they help a LOT. I used to have horrible
neck pain from the computer and now not so. Also, try to sleep flat when you are on your back. (Use your pillow when you are on your side.) That also helps. But especially try lots of arm and shoulder stretches, and there is one where you are on all fours, kicking your leg back while aching your neck upwards.