So can one person explain to me why these banks that are supposed to be throwing roadblocks in front of MtGox "because they want to stop/slow down bitcoin" do not throw these roadblocks in front of Bitstamp or BTC-E or any other big exchange?
Which planet have you been living on for the last three years? This problem is not unique to MtGox. 40% of all exchanges have been forced to close in full or partly due to problems with banks. MtGox has had at least three bank accounts closed. (+ their PayPal account.)
Why is Bitstamp able to process my deposit in 2 days? And how is it possible that a withdraw from Bitstamp also only takes 2 or max 3 days?
MtGox can process your deposit in EUR (via SEPA) next day, or JPY in Japan in 2-3 hours. Please ask Bitstamp how their withdrawal time is possible, but their volume is much smaller than MtGox's. This is probably an important factor. Bitstamp had problems recently as well, with banks refusing to transfer deposits. Full verification of identity is now a requirement to trade there.