Menachos 65a (loose translation).
The Baisusim said that Shevuos was [just] after Shabbos. Rabban Yochanan Ben Zakai got involved and said to them “Fools, what is your source?”, and no one answered him except for one elder who answered “Moshe Rabainu was an Ohev Yisroel and knew that Shavuos was only one day, so he made it after Shabbos so the Jews could enjoy for two days”…
Even the Baisusim knew that the more Yom Tov the better (and Rabban Yochanan ben Zakai doesn’t contest that point). Not my ha’ara, but I wish it were.
So which part of davening and eating don’t you like? The davening or the eating? The only hard part of a three-day Yom Tov is ending it.
And does your wife/mother prefer cooking on Friday for Shabbos to just having Friday off?