I will agree.
What we DO understand is that there is a difference and distinction between generation and procession. But what that difference is is something completely beyond the realm of our comprehension. Perhaps as eternity unfolds we'll begin to have a little light shed on that, but who knows...
As short as analogies fall, there is a scriptural analogy that was touched upon in the filioque thread, and that is the analogy of a word and a breath coming from God (e.g. "By the word of the Lord the heavens were made, and by the breath of his mouth all their host). It's impossible to use that analogy to give an actual description, but I believe it is sufficient to demonstrate that there is a difference.
But one thing to consider is that only the Word was made flesh. The Father did not take on flesh, and nor did the Holy Spirit. The way that each person of the Trinity has been revealed to us is as distinct as each Person is distinct from the others. And the way that the Holy Spirit is revealed is in a way that is very different from the Word taking on flesh and showing Himself very plainly.
When the Son was revealed, it was as a baby covered in blood and afterbirth, being cleaned, being nursed, having his diaper changed, growing, eating, sweating, sleeping, praying, suffering, dying and rising from the dead.
When the Holy Spirit was revealed, it was as a rushing wind and cloven tongues of fire descending on the disciples. St Paul says that we are to be "filled" with the Holy Spirit. Christ said that the Holy Spirit would teach us and remind us of all that Christ did and taught; that He would lead us into all Truth.
The Holy Spirit is known by us when He fills us and makes Christ manifest in our lives.
One thing to keep in mind (not to confuse this thread with the filioque thread) - although the Orthodox do not believe that the Holy Spirit has an eternal origin in the Son, we also do not see the Son and Holy Spirit as two squabbling brothers standing on either side of their father, having nothing to do with each other and no relationship with each other.
Both "come from" the Father (although in distinct ways), and their life, along with the Father's life, is One Life. Although a word and a breath come from the "thought" in two distinct ways, their "missions" are related to each other. It would be wrong to envision two vectors moving from a single point 180 degrees apart from each other, as if one has nothing to do with the other save for their common source of origin.
So the Holy Spirit is our God whose Life is bound up with the Life of the Son. Outside of that, it would be very difficult (nigh unto impossible) to explain Him.