If you are waiting a long time to refresh your library, an SSD will definitely help there (since this task requires accessing many different files).There aren't many options that are compatible with the MP 6.1. You'll notice less of a benefit if you are only storing big files (maybe your videos, depending on how large they are). The SSD will also benefit you if your working with many different "small" files (like photos). The SATA-based SSD should be faster while not fully utilizing USB 3.0's maximum speeds. The summary of this all is: yes, you should expect faster speeds if you buy the SSD you listed. Again, note that your WD drive will only achieve those speeds when transferring single, large files. Most benchmarking software will also give you different results for sustained and random accesses. You can try benchmarking your current drive to see if it is capable of those speeds. I suspect that you'd probably won't notice these speeds (either because it's wrong or because it only occurs in rare circumstances). I did notice that your WD drive lists faster "maximum" read speeds than the SanDisk SSD.
This distinction is very apparent when open a folder that contains a large number of files (similar to refreshing to your media library in your Photos app). SSD's need negligible time between each file access, so you should expect pretty fast speeds even if your accessing many files at once. Thus, the above read speeds are sustained speeds, where the device is reading data from one location. This is because HDD's need seeking time to move their heads between accessing each file. For example, if you try copying many small files from an HDD, you'll notice that read speed tanks (e.g., down to hundreds of KB or less) even though the HDD is technically capable of much faster transmission. More importantly, SSD's excel at random read accesses. There are also standalone external SSDs that use thunderbolt and offer faster speeds than what USB 3.0 would allow) (For other readers considering using an NVMe drive externally, consider using a thunderbolt-based enclosure, such as this. Even if it did, you'll notice a speed increase since HDD's operate much slower than USB 3.0's speeds. This shouldn't be a concern for you in this scenario, since the drive you listed doesn't fully occupy USB 3.0's speeds.
Such drives would be bottlenecked if used through externally USB 3.0. There are NVMe SSD drives, for example, which offer much faster read/write speeds compared to older SATA-based drives (think thousands of MB/s). So, for most uses, you should see a speed increase. On the other hand, typical SATA-based SSD's have typical read speeds of 500 MB/s (which approaches but does not surpass USB 3.0's throughput). Typical HDD's have a read speed of around 160 MB/s, which doesn't fully utilize USB 3.0's throughput.
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