In Docs, Gemini can draft a first pass from a short brief, rewrite a paragraph in a different tone, or summarize a long document you didn't write into a few bullet points before a meeting. It's most useful as a drafting partner — getting past the blank page — rather than a final-copy generator.
Sheets is where it edges into genuinely technical territory: describe what you want in plain language and Gemini can suggest formulas, build a starter pivot table, or explain what an unfamiliar formula someone else wrote is actually doing. Useful for people who know what result they want but not the exact function name.
Gmail uses it for drafting replies in your own tone once it has enough context from the thread, summarizing a long back-and-forth you were cc'd on, and surfacing quick suggested replies for routine messages that don't need a thoughtful, from-scratch response.
Because it's built into apps you already use, there's effectively no setup — it shows up as a side panel or a set of suggestions inside the existing interface, with permissions and enterprise controls managed the same way as the rest of your organization's Workspace settings.
The trade-off is that quality varies with how much context is genuinely available: a Doc with only a title and no content gives Gemini little to work with, while a long email thread or existing draft usually produces a noticeably better first pass. Treat it as a fast editor and drafter, and keep the final review with a human, especially for anything going to a client or the whole company.