Final decision? Not to Tumblr.
Based on what I use my blogging for, Tumblr is not the right program for me. I am going to transfer my Tumblr blogs back into my original Blogger. Watch out for them soon. =)
I had made my own observations and conclusions, and this guys blog confirmed it. He even saw some things that I noticed and didn't like about Tumblr. (Like how it's so difficult to find your friends Tumblr blogs and follow them.)
Good-bye Tumblr, Hello again Blogger.