And then, there are our good friends lag and latency.
"Lag" in this case, might be attributed to video lag, caused by a slow or ineffective video card or onboard video chipset, coupled with a relatively slow computer.
Latency can be attributed to 1.) nominal network connection speed (Internet download/upload speed, measured in Megabits per second--the connection package you have with your ISP), 2.) network latency due to local conditions, 3.) network latency and pathing delays due to regional conditions, and/or (yes, they can "stack") client-to-server-to-client latency.
For many people, video lag can be reduced by either installing a better video card (or installing a video card and avoiding onboard video) and/or by using a faster and more competent computer. If you're using a notebook, then only the latter choice will work--you can't upgrade a notebook's video subsystem and it's not cost-effective to upgrade a notebook's CPU.
Sometimes latency can fix itself, as local or regional conditions improve, or the connection from the local computer to the login/game servers changes for the better. But if you have a slow (1.5Mnps or slower connection), or are using some sort of wireless *network* connection from your house to your ISP, you may encounter the loading problems as described by the thread starter. If Pazzuzu was still around, you could ask him about the "tin cans and string" Internet connection he used for several years. It wasn't pretty.
For example, one of my guildies lives in the back-of-beyond in the desert southwest and has a computer that's somewhat on the elderly and not very good side. With a lack of true cable in her location, she's forced to use a form of cellphone/mi-fi connection. With her in-game graphics settings at the lowest possible levels, she suffers through long screen loading times, low framerates, along with lag and latency problems. The positioning of the cell tower she connects through is particularly sub-optimal--it's elevated higher than her house, on a mountain, so the signal is poor, at best. It's terribly frustrating for her, but she soldiers on. (And no, "moving to where the Internet is" is not an option for her.)
She has also has had the problem, especially with HoS, that the thread starter described. In fact, she has to avoid being the last person in the party to enter HoS in order to avoid the "falling forever" problem, and that's with a recent client restart. Even then, not being last into HoS doesn't always work.
I don't see this as being a bugged instance. And as the thread has already been moved to "Not a bug", there's nothing that GF can or will do about the thread starter's problem. Since we have little information as to his specific hardware, nominal Internet connection speed, and location, there's not much more that I can provide here.