Well done Valadis for creating this, and thanks for sharing with us for free.
Thanks for the kind words Giorgos! Actually the plugin isn't too heavy, rather the AddThis script that it calls; if AddThis change their script in any way, making it heavier etc. I'm not responsible for that.
Two things would make it perfect:
1) Linkable parent menu items (not just linkable sub menu items)
2) Basic customization options from the back side (e.g. color of menu items, background, etc).