Depending on application you may well find that the SSD is not used much if at all after the initial loading. A little (
) background information that may be of some help
When LR or any other application first opens you will see a peak in disk access. Mine for instance (now that I have looked!) hits 70-80% on the first session. With PS open as well it may well hit 50-60% when PS first opened.
AFAIK if you close the applications down and reopen disk activity does not peak again at such high figures, maybe only reaching a few percent.
This is due to the way Windows (and Adobe?) handles applications and dynamically allocates and releases memory.
With LR and PS both open Windows reports 60% Used Physical Memory (16 GB RAM), 9391 MB in use 6741 MB available.
I have zero experience of Adobe Premiere so no knowledge of disk and memory requirements or general management and optimisation. My guess would be that for video editing the CPU, disk and RAM requirements would be higher than LR or PS.
The benefits of SSD really depend on how an application utilizes the disk.
Initial SSD boot to the OS should be very noticeably faster than HDD. As will be the case with opening any application stored on the SSD. Then obviously any access required to the SSD during an application run should benefit. Many applications do not need to access the disk once opened therefore you will notice no gains.
What I believe to be correct about the Adobe applications I use
(
Note: There are others here more expert on under the hood best setting than I):
Lightroom like other applications will benefit from faster booting of the application. More than 12 GB of RAM and a fast hard drive will offer benefits. If your image files, catalogues are on an external drive that is not an SSD then you will be sacrificing some performance over them being stored on SSD
Photoshop will also benefit from faster booting of the application. Max out on RAM always good (although I only have 16 GB currently - I will upgrade probably double). Photoshop will always write to scratch disk which is not usually an issue unless it runs out of memory then it will need read from the scratch disk slowing progress by a good margin. If the scratch disk happens to be an SSD then the impact should be minimal. With enough RAM then you may never see efficiency drop below 100% and therefore the scratch disk will not need to be accessed.