Wow. I completely agree with you.
Freshness.
I see your point about greed. I agree. Greed can certainly spoil a good dose of grace. Been there, done that.

The hope is that we can learn from our mistakes in order to allow the grace to open us up to our full potential and awareness in Christ, rather than our ambitions to getting more, and thus getting in our own way, sabotaging our own efforts.
What it may boil down to is reexamining our motivations. And if the motivation is based in love then we enter enlightenment through a sustainable force.
I think you are right about preconceived notions too, they do hinder us. That is another reason that it takes so long. Not only doubts, fears, worries, etc., get in our way, but so does prior programming such as you mention.
But once we've reached this state of "freshness" there can be no mistaking it, you are truly one with all that there is.
The key possibly is love. With love as your vehicle then you can resist the temptation of greed, to grasp for more than you are capable of understanding at any one point, resist your temptation to label. Since time and space fall away, an ever present now exists and you experience truth as truth truly is and not how you envision it to be.
In that state you can do whatever needs to be done, or realize, rather than what you want to be done, or think you want to realize, simply because the all knowing essence of you requires it of you, and not because you have your own selfish agenda.
I truly think you have hit the nail on the head in your assessment.
If so, then it becomes necessary for you to begin the process of housecleaning your spiritual essence so that you are able to live in that state of grace indefinitely, be the Christ as Christ is you.
What better purpose is there for you to do?
Once there, and in full awareness that you are, and fully maintained, then the whole concept of life may take on a more inclusive meaning.
The key is probably love. However, that purity of love may not be that simple to achieve.
But it is possible, and I believe sustainable.