The reason it matters is not the individual reviewer, who has already left and is unlikely to return specifically to read your thanks. It is the pattern a visitor sees when they open your profile. A page where every review has a reply reads as a business that pays attention. One where only complaints have been answered reads as defensive, because the implication is that you engage only when something is at stake.
There is also a practical effect on future reviews. People who see that responses happen are more likely to leave one themselves, because writing a review feels less like shouting into a void when there is visible evidence that somebody reads them. Businesses that begin responding consistently frequently notice review volume rising afterward without any change to how they ask.
Keep the replies short and specific, which is what separates a real response from an obviously templated one. Two sentences is enough. Reference something particular about the job, thank them for a detail they mentioned, and stop. Readers can identify a template within a few entries, and a profile where every reply says thank you for your kind words in identical phrasing does less than no reply at all, because it demonstrates that nobody actually read them.
Avoid turning the response into marketing. A reply that thanks somebody and then describes your other services, or invites them to visit your website, converts a genuine moment into an advertisement in front of an audience who came to read customer opinions. It reads as extracting value from somebody's goodwill, and it is noticed.
Vary the phrasing deliberately. Different opening words, different lengths, and different specifics. This is not about creativity for its own sake. It is because the profile is read as a whole, and the impression of attentiveness depends on the replies looking like they were written on separate occasions by a person rather than generated in one sitting.
Respond within a reasonable window rather than immediately or in batches. A reply appearing within a few days looks natural. Twenty replies posted on the same afternoon after months of silence is visible in the timestamps and undermines the impression you were trying to create. If you have a backlog, work through it gradually rather than clearing it at once.
Use the response to reinforce something true about how you work, without claiming anything. If somebody mentions that you arrived when you said you would, acknowledging that punctuality matters to you states a value through an example rather than an assertion. That is considerably more persuasive than any claim on your website, because a customer supplied the evidence.
There is a secondary benefit worth knowing. AI systems now read review text and responses when summarising a business, and a profile where the business engages substantively gives those systems more to work with than a wall of unanswered stars. That effect is difficult to measure and it costs nothing to capture.
If the volume ever becomes too large to reply to everything, prioritise negative reviews, detailed positive ones, and anything recent. A short reply to a thoughtful three paragraph review is worth more than a reply to a bare five star rating with no text.
Set a rhythm rather than treating it as a task, since the whole point is that the profile looks continuously tended. Ten minutes once a week clears whatever arrived and keeps the timestamps natural, and it is short enough to survive a busy period. Businesses that treat responding as a project do it thoroughly once and then not again for months, which produces exactly the stagnant impression the exercise was meant to avoid.