Using Debian for probably a decade now (before that, various Linux distributions).
IMHO only community driven distributions with great (in size as in quality) communities are worth investing time/energy and learning.
One reason to ditch Debian would be that the software I need to run would not run anymore on it or that there would be a too strong commercial influence on the project. Another reason is for play/entertainment where better options exist (SteamOS) or if I need up to date hardware support (Fedora).
After more than two decades with Linux, I will not play around with non mainstream distributions anymore. Have seen too many come and go, and in the end I would rather do something interesting with my computer than playing around with the Linux distribution of the week.
Sorry, but this post is really, really bad.
State clearly which distro and which versions of Gnome and dash-to-dock and perhaps what other extensions you are running, and there might be a chance someone is able to help you. (Also state clearly the source of your Gnome extensions).
Most of the hints/solutions in answer to this post are also not good. If dash-to-dock triggered the malfunction of the gnome-shell on your system, just login to a terminal and use dconf or gsettings to set org.gnome.shell enabled-extensions to an empty array or to an array w/o dash-to-dock.
I am happily running dash-dock@micxgx.gmail.com on multiple physical and virtual machines w/o any trouble, using the dash-to-dock provided by my package manager on different CPU architectures YMMV.