I think you are beating a dead horse here.
This has been discussed before (search the forums), and since we are already up to Lightroom 6 and Adobe hasn't done it in the approximately 10 years that Lightroom has existed, I really don't think its going to happen.
So, why can't I have a Folders panel in the Develop module as well?
Please add your me-too vote and detailed opinion to this feature request in the official Adobe feedback forum: Lightroom CC - Go to Album ; Publish Services and Folders in Develop Module; | Photoshop Family Customer Community . Adobe product developers read every post there, but are rarely seen in this forum. (I do agree with dj_paige that it's unlikely Adobe will change this, unless at some point they decide to do a major regroove of the entire LR interface, at which point all the feedback in the feedback forum will have some influence.)
In addition to the tip from 99jon, you could use the Any Source plugin, which has a command that lets you quickly search and select any folder, collection, or published collection, in any module including Develop.
As usual, John and I agree.
But I'd like to add that I have been using LR since LR 2, and I see absolutely no interest on the part of Adobe to improve "folder organizing" in Lightroom. I cannot think of a single change made to Lightroom that makes folder organizing easier, and really, that's not the idea behind Lightroom anyway ... Lightroom is a database organizing tool, not a folder organizing tool.
In addition, it seems to me (and I know this rubs some people the wrong way) that Lightroom tries to encourage a more orderly workflow, by not allowing you to organize into folders except in the Library Module. In other words, a more orderly workflow, that works much easier inside of Lightroom, is: do ALL of your organizing, then do ALL of your Developing (or perhaps do it in the opposite order). The idea of not putting photos into folders until such time as you have Developed the photo, and then do it one at a time, falls outside the underlying concept of Lightroom.