Think of it this way: There is something to be learned about the nature and character of God in this. First, it confirms the correspondence between the Feast of Passover, and Christ as the Passover Lamb. Second, it confirms the words of Christ when he said He would rise on the third day, making His words literal, which is how they were meant and understood by His disciples. Thirdly, God is totally consistent in how He does things, and is accurate down to the smallest detail, which is proof of His general revelation to all men. In other words, the proof is there if you have eyes to see it.
God is not man, that He should lie, neither the son of man that He should repent. Hath He said, and shall He not do it? Hath He spoken, and shall He not bring it to pass?
It's not about esteeming one day above another, it's about seeing that God is absolutely accurate in His deeds, and totally consistent in His actions. Besides, what would it hurt to esteem the day of Christ's crucifixion as an important day, and likewise the day of His resurrection? In so doing we honor Him who died for us, that we may be made the righteousness of God in Him.
I like that explanation. I try to be as "Christian" on May 25 as I am on Dec 25 or Easter!!!