The Covid-19 pandemic crushed all-you-can-eat buffets. The owner of Old Country Buffet and Furr’s Fresh Buffet filed for bankruptcy in 2021. About the same time, so did Cicis and the owner of Souplantation and Sweet Tomatoes. Operators cited occupancy restrictions, bans and health concerns. But now buffets are making a comeback. In March, visits to three leading buffets — Golden Corral, Cicis, and Pizza Ranch — were up 125% from January of 2021, according to data from Placer.ai, which tracks foot traffic at restaurants and stores. That figure outpaced the growth of visits to fast-casual chains and full-service restaurants during...