Yes atemi-waza and kyusho-jitsu exists in aikido. It's an heritage from the traditionnal Yagyu and Daito-ryu jujutsu.
I have the same opinion as mike; learn and experience kyusho-jitsu BUT keep in mind that's not the principle point of the technics in aikido. We call that in my school "little technique". To learn to lead flowing ki and to unbalance Uke is more difficult and more efficient. Use atemi and/or kyusho sometimes to disturb Uke
Open your eyes and your heart to other disciplines and stay critical.
Any technics is better than an other, it's only different.