I was reading this DK tanking article and I saw the screenshot of worldoflogs.com which can show a buf timeline. I've never seen or used this feature before so I went to check it out. So, using one of our parses:
If you click the top tab "Buff details" and click the bottom tab "Buffs cast", you can add abilities underneath the timeline by clicking the '#' symbol next to each buff. You can do this multiple times and get a sense of spells used during the fight.
Here is the original DK tanking article.