Yes or no and are they valuable are two different questions. The answers may also be different. In case of the latter question, the answer may depend on the perspective.
The 1st question, yes or no? It's a yes. From the Scrum or XP point of view, the standup is an essential activity. If you don't have daily scrums, then it's not really Scrum, it's called "scrum, but we don't do daily standups" or scrumbut for short. if you want to include a Kanban perspective, most Kanban teams do standups, even though their method doesn't prescribe them.
The 2nd question, (how) are they valuable, is more complicated. If you practice Scrum or XP, you've got to believe that the standups are essential to promote collaboration, teamwork and make your team more effective. So the answer is definitely valuable.
The lean proponents' perspective is very different. An extreme lean view is that your customer doesn't care if you do standups, so they are just waste. What do you with waste? You cut it to the minimum, ideally to zero.
A more moderate lean view is that while not exactly waste, daily standups are a coordination cost and not a value-added activity. You can play devil's advocate with your Scrum colleagues and ask them: if you think your 15-minute standups are a value-added activity, why don't you do 30 minutes of them every day or 45 minutes and easily magnify the value added?
Kanban, which has lean roots but aims to deliver on the Agile Manifesto principles, resolves this paradox by doing standups, but using a very different meeting structure than the traditional agile standup format. The result is a much shorter meeting, which aligns with the Lean point of view. This book has an example where a 50-person Kanban team does daily standups in 10 minutes.
To summarize, whether or not to do daily standups, the answer is a definite yes. But, are they valuable, how valuable are they -- it depends.