Completely agree with the OP.
I haven't been to a meeting in 2 years and have been listening lately to the new communication tool they use on their tablets for meetings. My Mrs is currently listening to this in the living room and can over hear.
I too noticed the constant use of the 15th century name 'Jehovah' all the way through the watchtower article and in the answers and prayers. It's incredibly excessive and annoying.
What they don't realise is that it is a very over familiar way of refering to the creator of the universe. Could you imagine one of the queen of England's servants speaking to her by calling her "Elizabeth" !!!
Whenever Jesus prayed to God, he always referred to God in an a close intimate way by calling him 'father'. He even told those in the sermon on the mount how we were to pray to God.. "Our father, who is in heaven......."
Whenever I pray to God, I always address him as my heavenly father. I never refer to him as Jehovah.
The jdubs are way of track on this one. But hey, it's a cult!