The Clouds of Glory marked travel movements for the Jews in the desert, and according to Midrash, flattened obstacles, cleared wild beasts, and possibly cleaned their clothing too. The Chag of Succos is dedicated to commemorating them. There is no equivalent display of appreciation for the manna or Miriam’s well, which are all along the same line of supernatural providence for the nation. Why are the Clouds remembered, and not the well or manna?
The Chida explains that food and water are the basic requirements for survival. Taking the Jews into the wilderness of the desert necessarily meant God would provide nourishment from somewhere; what could otherwise be expected? The Jews had their own shelter through tents and huts. But Clouds that protected the camp from the harsh sun, and according to Midrash even more, is far beyond what could have been expected – לפנים משורת הדין.
Secondly, they were a gift that showed God’s love for the people. This is proven by the fact that people outside the camp – such as the Egyptian stragglers and people forced out due to tzaraas – did not benefit.
Thirdly, the Clouds were appreciated far more than the manna and the water. The Jews complained and gave orders regarding the food and drink on offer in the desert – but they never complained about the Clouds. The Clouds were the perfect gift.
The Chida notes that perhaps these are hinted to:
לְמַעַן יֵדְעוּ דֹרֹתֵיכֶם כִּי בַסֻּכּוֹת הוֹשַׁבְתִּי אֶת בְּנֵי יִשְׂרָאֵל בְּהוֹצִיאִי אוֹתָם מֵאֶרֶץ מִצְרָיִם אֲנִי הֹ אֱלֹהֵיכֶם – In order that your ensuing generations should know that I had the children of Israel live in booths when I took them out of the land of Egypt. I am the Lord, your God. (23:43)
לְמַעַן יֵדְעוּ דֹרֹתֵיכֶם כִּי בַסֻּכּוֹת הוֹשַׁבְתי – I gave it to you as a gift; and they were enjoyed perfectly
אֶת בְּנֵי יִשְׂרָאֵל – I gave it to the Jews; not the Egyptian stragglers.
בְּהוֹצִיאִי אוֹתָם מֵאֶרֶץ מִצְרָיִם אֲנִי ה’ אֱלֹהֵיכֶם – I took you out of Egypt; so I fed you, but didn’t have to provide the Clouds.
The Clouds were an incredible, and totally unwarranted display of affection to the Jews. This is commemorated on Succos.