From a usability standpoint, all the advantage of LL is on the hoster's side. For the end-user the latency is practically never adequate to prevent a frustrating experience. I use whatever GM scripts or other hacks I can find to just load the damned page, if such workarounds exist.

Recently eBay moved to LL in most of its searches, but this can be obviated by re-searching from the Advanced link, for instance.

This is ridiculous to me. I open a new tab in my browser and if I know it's a long page with lots of pictures, like some blog or ebay listing, I might postpone switching to the tab with the single purpose, so it loads all the content in the background and the page is completely ready for me to scroll.

If it's combined with infinite scroll it's even worse. In such case I need to manually scroll the page for as long as I need so it starts loading the damned content. Not many things bring me so close to the point of rage.