It is not 1000 off of 5% more attacks.
It is the knowledge that it is 1000 off the attack which would otherwise kill you. It is the knowledge that you take smooth damage, and can walk into a 0.9 attack speed average fight and ensure HS will prevent your BV each hit. Thats worth whatever you think it is, many like it.
If you have ever died with < BV damage -ve, then being block capped would have saved you. It also makes your damage less spiky, as there are not 5% of hits you take 1000 more than expected. It becomes exponentially better @ < 35% health (0.94*0.97*0.97*0.7 = 62% damage taken after armour - BV, in effect your BV becomes much more valuable, as it takes a hit from: (0.88*Hit-BV) to (0.62*hit-BV), meaning the block prevents way more than it would have).
As an example, 10K hit post armour, assuming worst cases:
No BV: 8800 (12% DR)
BV1000: 7800 - (22% DR) ~ 11% of previous total prevented
No BV AD: 6200 (38% DR)
BV1000 AD: 5200 (48%DR), ~ 16% of previous total prevented
At the Heroic / Early T7 level you will likely be 5-10% off, at the late T7-T8 you will likely be block capped by default unless you gear to avoid it, at this stage in the game don't gear for it but don't try and avoid it is my best advice.
I would note at the same time, that your talent build goes against the common wisdom for Tankadins, and at least at the moment you are wearing gear that looks like you are horribly confused, both gearing for stamina (violet badge + gossamer, 2/3 icebane (maybe 2nd last boss of naxx, but you don't need that really), using block libram still from old badges etc), avoiding better reputation gear etc.
If you have some solid maths to back up going against conventional wisdom, then please throw it out there, until then common wisdom would tend to prevail and suggest that block capped is good, and that pushing stamina is a plan that shows the old way of thinking rather than the new. (PS, I know my gear sucks and is badly enchanted atm, but I haven't been raiding and have been focusing on levelling my enchanting beyond doing gear I tend to replace the second I enchant it

).
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