Well here is a real world example of why an ESB is a nice piece of infrastructure when things fail. I am working with a company which had a failed transaction. An ESB is being used to broker communications across multiple applications. The failed transaction had originally been created by one of those applications and placed on a JMS Queue for processing. Because there is an ESB, the destination service is not only available over JMS but also HTTP (the default transport for the waiting BPEL Service) or other transports that you can choose from.
We simply resolved this issue by loading the SOAP request into a SOAP Client in Eclipse and doing an HTTP Post to the service.
There are many other reasons to using an ESB but just the flexibility in supporting multiple transports can help out in a pinch.
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