Why is saving so hard?

Tax return is back and the make believe plans that we had for it goes right out the window just like years past. Why change anything now right? As soon as it gets deposited into our bank account, we go on a spending frenzy of sorts just because it's there. If only we could sit back and save it or better yet follow through with our plan. But we never see the big picture, we only see the here and now. The "I'm bored" syndrome that sends us in said frenzy. Oh well, it's fun while it lasts right?