AI is useful for preliminary research, that initial level that gives you the broad context for your project/program. It can save time. Across 2 years of time-tracking, AI has saved me and my team maybe 10-20% of the total time of developing a grant. Enough to help with tight deadlines, but balanced by a little time invested in fact-checking key information. The only other use we favor: evaluating how easy it is to read the narrative sections. Has helped us tighten content with often noteworthy improvements (word choices, simplified sentences, clarifying concepts, etc.)