I too have been using photobucket for a couple of years. I participate on about 6 or more forums regularly and photobucket has always worked great for me.
Log-in one click i'm in my folder, another click, I'm uploading and I can tag multiple pics to upload at once. I have over 100 images in my folder and no issues. After upload one click I'm back to the main gallery one click I have the link for posting. Doing thumbnails requires a edit, because their bbcode/url puts you inside the photobucket site, I prefer to have the thumbnail load the larger image only, so I simply edit the url and it works fine.
Editing, as for size editing I do that in photoshop before I upload, it is a lot faster than waiting on a web editor. Same with adding any text or formating, photoshop on my local pc is going to be a lot faster. If you don't have photoshop there is one or two decent
free photo editors..
I just did a test, I copied a page from a website as a jpeg image, loaded it into photoshop cropped so only a 7 x 11 portion would show, saved as a new jpeg, uploaded to photobucket, checked the image, and had the bbcode link/url to upload to any forum in about 3 minutes. I have tried other image storage sites, and while others have some nice features photobucket was the easiest to use and share.