Perhaps non-crafters aren't feeling the "bank-slot" pain; but as a crafter - I am singing the blues. I have several alts set up to act as "mules". (There goes my opportunity to actually play these toons) I've purchased the first inventory and bank upgrades - the next levels may as well be 1 million or 3 million gold as even my ambitious Level 9 and Level 11 alts can't earn that much and still afford other necessaries. So like many others, I log on and off multiple toons to stow my mats. I'm just at crafting level 7 and already the slots are bulging!
I'm told other games at launch had limited storage; but after their customers bugged them they accomodated them with more a reasonable storage system. Having crafted in GW2 where you could send your mats from the questing field direct to a dedicated crafting bank with ORGANIZED sections; ESO storage system is leaving me starved and unhappy with the amount of "play time" being robbed to shuffle mats and drops around on alts.
I think we need to speak up and let Zenimax know that the storage system is not holding up. In time, the less intrepid might abandon the game because of the "hassle". I believe I spend anywhere from 25-30% of my time organizing.