一番よく使われている表現はIt is greatly appreciatedです。
この2つの表現はほとんど同じ文章で同じ意味として使われます。しかし文章の最後の動詞の前に副詞を使用するのが一般的なので"It is greatly appreciated"が日常でよく使われる表現です。
It is greatly appreciated whenever you bring us our mail on time.
Your presence at the wedding was greatly appreciated.
It is greatly appreciated if you keep your hands inside the ride at all times.
It would be greatly appreciated if you could bring a few people to my party this weekend.
Thank you for giving us your sincere condolences. It is greatly appreciated.
I didn't get a chance to thank you for the lovely wedding gift. It is greatly appreciated and we loved it!
It is appreciated greatly whenever someone performs a random act of kindness on the streets.
We thank you for your continued membership. It is appreciated greatly in times like these.
It was appreciated greatly when the king visited his loyal subjects.
Did you say that it is appreciated greatly if we bring our own drinks to this event?
It is always appreciated greatly (more than just "good") whenever someone takes their shoes off in the house without having to be asked.
It is appreciated greatly by the majority of people when you dress in your unique fashion.
The show was appreciated greatly and celebrated by the unwashed masses.