Rene,
You said:  "How do we explain this?  Are there certain Christians that God just puts THIS IN THEIR HEARTS from the moment they are saved?  To LOVE HIS APPEARING?  To long to see him return?"
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This very thought came up recently in my life. . .and I have concluded that this is a gift from God.  Would I have chosen to search for years and even decades for His appearing?  Probably not.  This is not something I chose.  Am I glad I keep looking for Him?  YOU BETTER BELIEVE IT.

It is a yearning in my heart to persistently search for His return.  The only explanation I have is that God gave me this desire.  There is nothing in my life that has continued to be a part of my life for 35 years, except this searching for Him.  Longing for His return has been a constant in my life.

This is not to sound puffed up or better than others, because it is only through God's great mercy and providence that I am able to continue in this endeavor.

Longing to see our Lord Jesus,
Denise S