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In another SO question, I've seen several people recommend me to always use TryGetValue.
While I always use TryGetValue over the Contains?/Access pattern, I avoid this pattern on purpose when I expect the key to always be in the dictionary. I then go for a direct indexer access, so that an exception is raised if the key isn't there, because something unexpected really happened (i.e. the key wasn't in the dictionary while I expect it to).
Since there seems to be a general consensus against my "best-practice" (3 out of 4 people on the post I mentioned explicitly advised to use TryGetValue at all time), I'm eager to read an extended discussion on that topic...