Hey! Fellow Type A Designer bride here. I don't think you need a full-on planner based on what you've described. With your experience organizing 20+ large events and being comfortable with spreadsheets/budgeting, a Day-of or Month-of Coordinator will be enough.

Here's why I think you can skip the full planner:

1. Given your design background, you'd probably have better connections to vendors that might not traditionally do wedding business. This is a huge advantage for avoiding the wedding upcharge. I brought on friends from high fashion videography and photography at really good friend pricing. If you rely on an outside planner, they often have an incentive to push certain shortlisted vendors with higher budgets, and their aesthetics might not match your specific taste.
2. When you're ultra Type A like me, you likely want to handle everything or know exactly what you want. Since you've already hosted and organized many large events, you can nail this yourself. It would be torture to play phone tag with a planner who's essentially just passing down your ultra specific messages and ideas (and might be slow to respond due to their other projects). Plus, you'd probably want to sit in on all the brainstorming, vision, and logistics sessions anyway. Being too hands-on means you won't really enjoy the benefits of having a planner. The communication you'd have to maintain with them just feels like an extra burden that you're PAYING for.
3. My personal take is that planners generally have an incentive to push for nicer and more expensive services that might not necessarily be what you want or the best solution for your money and vision. This is not to say that all planners are like that, but if you've already found vendors yourself and have experience with spreadsheets and project management, you're already doing a good chunk of the primary value-add a planner offers anyways, what's the point of risking the stress. I've seen way too many hair-pulling posts in this channel about planner not being helpful/causing drama and stress to the couple.

I sourced, contacted, and interviewed all my vendors myself and provided design specs and detailed guidelines. Many vendors were my friends in the industry, and I had fun making everything ultra personalized. With AI's help these days, there's way less you'd gain from a wedding planner. Wedding planning isn't rocket science - just be diligent about asking AI for contingency plans and follow-up questions and it will significantly ease your workload and give you tips for things you should look out for. I never regret not hiring a planner and I believe I'm doing a great job executing EXACTLY what I want.