I think it would be convenient if the activity page also lists the moments whenever I Up Vote or Down Vote a post.
What is meta?
- Any Stack Exchange user can ask a question
- The community provides support, votes on ideas, and reports bugs
- Your voice helps shape the way Stack Exchange operates
If it is listed in the activity page then it wont be anonymous anymore.
Also why do you want to know about which question/answers you have up/down voted. In worst case, you will anyway know when you see the highlighted up/down arrow on the post which you have up/down voted anyway.