Looking on the internet deeply has found these results:

I am grateful to you is the most popular phrase on the web.

I am really grateful to you 1134,000 results on the web	I am grateful to you 1376,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
I'm really grateful to be here. Well, I'm really grateful to you. I am really grateful to you for that day. I am really grateful for the support you have given me, but the EPP was the first to say that they do not want this because it is alone. Chuck, I am really grateful that you were willing to help me, But all I needed was someone to give me money. I'm really grateful to have you in my life. I am really very grateful to President Santer for making this clear. That day... I am really grateful.	Madam President, I am grateful to you for giving me the floor. Mr Santer, I am grateful to you for your remarks. Mr President, I am grateful to you for that direction. This is why I am grateful to you, Mr Vitorino for taking up these problems energetically after Tampere. Nothing. Actually, I am... I am grateful to you. Mr President, this is somewhat earlier than expected, for which I am grateful to you. Mr President, I am grateful to you for giving me the floor to answer questions. Mr President, I am grateful to you for allowing me to reply to Mr Vallvé, as this question is also important.

I am really grateful to you

1134,000 results on the web

I am grateful to you

1376,000 results on the web

More popular!

I'm really grateful to be here.
Well, I'm really grateful to you.
I am really grateful to you for that day.
I am really grateful for the support you have given me, but the EPP was the first to say that they do not want this because it is alone.
Chuck, I am really grateful that you were willing to help me, But all I needed was someone to give me money.
I'm really grateful to have you in my life.
I am really very grateful to President Santer for making this clear.
That day... I am really grateful.

Madam President, I am grateful to you for giving me the floor.
Mr Santer, I am grateful to you for your remarks.
Mr President, I am grateful to you for that direction.
This is why I am grateful to you, Mr Vitorino for taking up these problems energetically after Tampere.
Nothing. Actually, I am... I am grateful to you.
Mr President, this is somewhat earlier than expected, for which I am grateful to you.
Mr President, I am grateful to you for giving me the floor to answer questions.
Mr President, I am grateful to you for allowing me to reply to Mr Vallvé, as this question is also important.