Scripture is about who God is, and our need to repent & believe, and how we should live to follow Him. As such, it leaves a lot of stuff out, which is why systematic theology texts mix a lot of philosophy in.
Where scripture is silent, we just don't know. And I'm not too trusting of some guy on TV who says he has visited heaven, and learned what God didn't reveal to the prophets or apostles!
However, there is this:
"19 For the creation waits with eager longing for the revealing of the sons of God. 20 For the creation was subjected to futility, not willingly, but because of him who subjected it, in hope 21 that the creation itself will be set free from its bondage to corruption and obtain the freedom of the glory of the children of God. 22 For we know that the whole creation has been groaning together in the pains of childbirth until now. 23 And not only the creation, but we ourselves, who have the firstfruits of the Spirit, groan inwardly as we wait eagerly for adoption as sons, the redemption of our bodies." - Romans 8
My suspicion is that heaven will be a much bigger and more incredible place than most preachers think about...
Revelation gives some tantalizing hints, but I think that John simply didn't have the words to describe what he saw in his vision. I agree with your statement and would take it to the point that nobody could ever conceive of its full description.