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While I'm comfortable in the command line, I find a GUI easier to navigate and able to fit/scroll more information at a time.
In the Windows world I'm used to TotalCommander, which has a really nice integrated viewer that works with arbitrarily large file sizes. It doesn't do "less", but presssing F2 is easy.
I don't know what the equivalent SL/RedHat (Gnome) program would be. I mostly use gEdit but it's a dog on large files. Something that opens 1GB files really fast, is able to search forwards and backwards and select large amounts of text.
less is a pager/viewer, Gedit edits... did you search your distro's repos for "text viewer" and "text editor"? There's a lot, try them out – Xen2050 – 2018-05-11T12:33:21.860