Kevin Cross knew it was a great idea. He just didn’t realize that so many people at Lippes Mathias Wexler Friedman LLP would want to use it so soon. “It gets a lot more use than I actually thought it would in the beginning,” he said. “I thought it would take some time, but it’s pretty regularly used.” He’s referring to the “collaboration room” the firm opened earlier this year in its home office at Fountain Plaza in Buffalo.