Bitcoin allows for escrow transactions, where a third party can act as a referee in case there's a dispute in the transaction. It has the important property, absent from current escrow setups, that the escrow party never holds the money: they have the power to accept or reverse a transaction, but nothing else. It limits the trust commitment towards the escrow service.
People keep saying this, but how much is it actually used? How much do you have to pay the escrow service? How good are they at dispute resolution?
Also, the money has to be kept in escrow until the possibility of a dispute is over, which adds a substantial delay.
I imagine escrow being done by the likes of Airbnb, in the case of the service. It won't be error free, but should stop the absolute frauds. In those cases, the escrow service is already paid for: it's the market that facilitated the transaction.
As for the money being kept in escrow, that is the definition of escrow. The alternative is the scenario of credit card payment processors, which keep the money for a period, and retain a fixed percentage of sales turnover, as a guarantee for refunds. From the merchant perspective, the average payment delay should be shorter using bitcoin than it is with credit cards.
The problem with making it "easy" to move money is that fraud becomes easy as well. There was an article on HN the other day about someone who wired $4k to a fraudulent AirBNB host. The credit card system skews towards assuming that the merchants are fraudulent and the customers mostly honest. Bitcoin goes in the other direction: it's entirely caveat emptor, there's no fraud protection or recovery at all. If your key is used to send bitcoins, by you or someone else, they're gone to that address. This allows for the low transaction fees but creates a trail of people who've lost money, whether on mntgox or localbitcoins or random internet purchases.
(I've been playing with the description "uber for banknotes" for a while; the disruptive evading of existing regulated systems is important to both Uber and Bitcoin)