Tears
There will be no tears in heaven. The Bible says that He will wipe away all our tears. It is hard to imagine there being no tears. No sorrow or pain, yes, but no tears.... You've heard the phrase Tears of Joy, well it is hard to imagine there being no tears at the overwhelming joy of seeing Him face-to-face!
I suppose, though, that is one reason why we'll get new bodies in heaven...to have bodies that can take in the unlimited joy of seeing the Father & Son face-to-face! And, you know that heaven will be so much more.
But, as awesome as heaven will be, I think, that seeing the Father the Son face-to-face will be the very best thing about heaven!