Dreaming of riding a chairlift up a ski slope indicates that you are achieving new heights and overcoming your fears. You are in control of your emotions and are confronting any feelings and inhibitions you have been repressing. You are close to bringing them to the surface.
To dream of riding a a chairlift as you are watching other people suggests that life is passing you by. Instead of taking control of your life and being more proactive, you are just letting things happen. In particular, if you dream of a chairlift underwater, then it means that you are feeling numbed by your emotions.