An important part of most Jewish holidays is the holiday meal when it is a Mitzvah to eat and drink. Chanukah, however, is primarily celebrated by saying special prayers and lighting the Menorah. This is how we commemorate the miraculous victory of the small Jewish army overpowering the mighty Greek war machine and the jar of pure oil miraculously keeping the Temple candelabra lit for eight days.
Our Chanukah observances are more "spiritual" because the victory of Chanukah was a victory of the spirit. The Greeks wanted to make the Jews forget the Torah and transgress the Divine commandments. Thus, it is fitting to celebrate the holiday with less emphasis on food and more emphasis on spiritual activities.
The difference between other holidays and Chanukah can be better understood by comparing water, bread and wine - foods served at holiday meals, with oil - used for the Chanukah lights.
Water, bread, wine and oil are all metaphors for the Torah. Water and bread are the staples of our everyday existence. In contrast, wine is not a daily necessity, it contributes an element of pleasure to our existence. Oil is not required for our day-to-day existence and is never served as a food in its own right. It is used in small quantities to add flavour to other foods. Thus, it too, is associated with the quality of pleasure.
Water and bread are metaphors for the concepts of Torah that are necessary in order to know how to observe the mitzvot properly. Like bread and water, this knowledge is necessary for our very existence. In contrast, wine and oil are metaphors for the inner dimensions of Torah, the study of which adds pleasure and vitality to our observance of the Torah and mitzvot.
Taking this a step further, there is a difference between oil and wine. Wine is drunk as a beverage, while oil is not. Regarding the symbolic meaning of the two, wine refers to the inner dimensions of the Torah that can be perceived by a sensitive eye. In contrast, oil refers to the deepest secrets of the Torah, those that transcend revelation. And Chanukah is associated with these deepest levels of Torah.
Warmest wishes for a very happy Chanukah - may the lights of the Menorah bring total victory and true peace to our Holy Land.