It is because you have been using it for more than a decade and you so not want to use other ones.
Your comment is applicable to everyone, including yourself. I don't want to use other ones because there is no need, I had 0 issues with Imgur.
What I do is tightly connected to graphics and imagery of any kind. I use different image hosting services for different needs. Often times I have to use something else I used to use. I know what works best for me.
It is not hard to upload images anywhere. I'm not making a big deal about it, I just like Imgur. It is like arguing about what cheese tastes better. It is subjective.
You can resize your image on this forum if the image uploading site that you are using does not have resizing
I can resize images in Photoshop, but with Imgur I don't have to - it gives me a size table I can choose from depending on the need. That's the point.
The speed on other sites are fast too. With what I saw, faster than Imgur
It depends on where the uploader and the servers are located. For me, Imgur is faster. For you, some other service may be faster.
I can use "talkimg" but it is a new service that can be dead in a couple of years. Besides, it allows embeds only to BitcoinTalk - I don't want to have an image hosting account for each forum/social media site.
I have been using Imgbb and a few others but they are slower and less convenient than Imgur. There are probably other alternatives designed for image snippets/screenshots that I haven't tried, but the ones I tried are no good. Most importantly I've never had issues with Imgur and it does what it is supposed to do.