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There is a much better chance of knowing the destination if you can see the entire URL though and it's not just about deliberate misdirection. For example: If you can see the full URL for a link to news story with only a vague description, it's a quick filter on whether a) it's interesting to you b) you've already read it c) it's suitable reading for the environment you're in.
Can users edit the tooltip? If not, can you explain in layman's terms the downside(s) to showing the full URL?
Without the tooltip showing the entire URL, isn't every link a potential rickroll? It's something that puts me off and reduces usability, regardless of the merits of redirection/affiliate links.