I would suggest Evernote Web Clipper.
Evernote Web Clipper is a simple extension for your web browser that lets you capture full-page articles, images, selected text, important emails, and any web page that inspires you. Save everything to Evernote and keep it forever. (Taken from this)
This extension is available for current modern browser, like Google Chrome. First of all, you must have an Evernote account in order this extension can be worked. All of your saved clip is your bookmarked page. It will be stored into your Evernote account. So, you can view them via Evernote web or desktop version. I have no experience using another device, like mobile phone. But, I am sure that exists in an application.
Answering what you're looking for:
and the result (via Evernote web)
arrange them in folders (the only thing Chrome by default does to help manage them)
You can arrange your bookmark via Evernote service. It's outside from your Google Chrome browser. This folder is called as notebook. You must organize the notebook where the page is gonna in before you save them as bookmark. Look this image below!
syncs across any devices I've signed into Chrome with
Like I just said, you can view them via Evernote web or desktop version. I have no experience using another device, like mobile phone. But, I am sure that exists in an application. I have experienced using Evernote desktop, it can sync all of your bookmarked page from your Evernote account.
easy/quick to use
I can say it is easy to use. I recommend you to try.
add reminders (ie. alert me on a specific day to go back to the page) (?)
You can set the reminder by adding the date and time.
I always use this extension to bookmark the page what inspires me. This extension is free as well as the Evernote service (you can start the free plan). If I missed something, please remind me what is it! Thank you.