EschCollection/DigitalVision/Getty Follow ZDNET:  Add us as a preferred source  on Google. ZDNET's key takeaways Half of employees now use AI at work at least occasionally. Many of them also don't know their employers' AI strategy. AI is boosting productivity, but not reshaping workflows. Half of all employees now use AI at work at least a few times each year, Gallup reported on Monday. Up from 46% last quarter, the new figure marks the polling company's highest-ever reported rate of AI usage in the workplace. Among more frequent AI users, the number of employees who report using the technology on a daily basis was also up (13% compared to 12% last quarter), as were those who report using it a few times each week (28% vs. 26%).…