Generally something repetetive and constant, no matter how good, starts to feel dull and common place after a while. But the thing is, this is pretty much due to decensitization of certain parts of the brain. Like the dulling cannabis (or any other) high, the lost magic you used to feel at Christmas, the decreased appreciation for a beautiful environment you live in every day. This isn't because you simply chose to lose the magic, it's because repetetive stimulation of particular neural areas becomes the biological norm, and the body continues to adjust to this stimulation until it comes back to a state of homeostasis. Like everything in life, even heroin eventually becomes something you need just to feel normal, because your body/mind has adjusted to the conditions.

That being said, I don't believe this decensitization would be relevant to heaven since god, a being of infinite power and wisdom, would have undoubtedly reset our physical or energetic state to not have homeostasis as a necessity, and therefor continue to reap the same benefits.